Answers
Answer:
57.26 %
Explanation:
Step 1: Write the balanced equation
Pt + 2 HCl ⇒ PtCl₂ + H₂
Step 2: Calculate the mass of Pt in 1.778 g of PtCl₂
According to the law of conservation of the mass, all the mass of Pt in the reactants must be present in the products. Since PtCl₂ is the only product that contains Pt, the mass of Pt is 1.018 g
Step 3: Calculate the percent by mass of platinum in PtCl₂
We will use the following expression.
%Pt = mPt / mPtCl₂ × 100%
%Pt = 1.018 g / 1.778 g × 100% = 57.26 %
Related Questions
Which mineral might scratch the mineral fluorite, but would not scratch the mineral amphibole? 1 brucite 2. magnesite 3. carnallite 4. olivine
Answers
Answer:
olivine i think
Explanation:
Choose the phrases that you think of when you hear the word Sun. Check all that apply.
Answers
what is the airlines of Brazil
Answers
Answer:
Airline IATA ICAO
Aerosul Linhas Aéreas 2S ASO
ASTA Linhas Aéreas 0A SUL
Azul Linhas Aéreas AD AZU
Azul Conecta 2F (AD) OWT
you place your hand on the thermos what type of transfer is taking place
1.Conduction
2.Convection
3.Radiation
Answers
Answer:
conduction
Explanation:
Conduction happens when 2 objects with different temperatures come in contact with each other. The heat transfers from the hotter object to the cooler object.Apr
Answer: Conduction
Explanation: Conduction: Conduction happens when 2 objects with different temperatures come in contact with each other. The heat transfers from the hotter object to the cooler object.
Given the law of conservation of energy, what happens when a 200°C iron bar is placed in thermal contact with a 30°C block of wood?
Answers
When a 200°C iron bar is placed in thermal contact with a 30°C block of wood, energy leaves the iron bar and enters the wood until the temperatures are equal.
Law of conservation of energy states that the energy cannot be lost or formed but it can only be transformed from one form to another.
According to the given question, the block of wood is at a lower temperature than an iron bar. Hence, heat will flow from the iron bar to the block of wood until the temperatures of both are equal.
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Octane (C8H18) is found in gasoline. It is burned for fuel in a combustion
reaction. The unbalanced combustion reaction for octane is shown below.
C8h18+ O2 → C02 + H2O + heat
When the reaction is balanced, how many carbon dioxide molecules are
produced for every octane molecule burned?
Answers
Answer:
Explanation:
It's 8
Lewis Structure for NO3-
Answers
Answer::
Explanation::
How much energy is required to raise the temperature of 4.0 g of mercury metal from 9.3 oC to 83.0 oC.
Answers
From the specific heat capacity of mercury, the amount of heat energy required to raise the temperature of 4.0 g of mercury metal from 9.3 °C to 83.0 °C is 77.792 J.
What is the specific capacity of mercury?The specific heat capacity of a substance is the amount of heat required to raise the temperature of a unit mass of the substance by one degree Celsius or kelvin.
The specific heat capacity of a substance is a constant that can be used to calculate the amount of heat required to raise the temperature of a given mass of a substance to any temperature.
The specific heat capacity of mercury is 0.140 J/g/k.
The formula for calculating specific heat capacity is given below:
Specific heat capacity, c = Δq/mΔT
where;
Δq = heat change
m = mass of the substance
ΔT = temperature change
The Heat required, Δq, will then be:
Δq = m * c * ΔT
Heat required, Δq = 4.0 * 0.140 * (83.0 - 9.3)
Heat required, Δq = 77.792 J
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You need to produce a buffer solution that has a pH of 5.09. You already have a solution that contains 10. mmol m m o l (millimoles) of acetic acid. How many millimoles of acetate (the conjugate base of acetic acid) will you need to add to this solution? The pKa p K a of acetic acid is 4.74.
Answers
The number of millimoles of acetate (the conjugate base of acetic acid) needed is 3162.28 mmol
What is pH?This is simply a measure of the acidity / alkalinity of a solution.
The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration
pH for buffer solutionpH = pKa + Log[conjugate]/[acid]
How to determine the number of millimoles of acetate (conjugate )From the question given above, the following data were obtained:
pH = 5.09pKa = 4.74Millimole of acid = 10 mmol Millimole of conjugate =?pH = pKa + Log[conjugate]/[acid]
5.09 = 4.74 + Log[conjugate]/ 10
Collect like terms
5.09 - 4.74 = Log[conjugate] / 10
0.35 = Log[conjugate] / 10
Cross multiply
Log[conjugate] = 0.35 × 10
Log[conjugate] = 3.5
Take the anti-log
[conjugate] = anti-log 3.5
[conjugate] = 3162.28 mmol
Thus, the number of millimoles of acetate (the conjugate base of acetic acid) needed is 3162.28 mmol
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Plants use sunlight to produce some ATP during photosynthesis. How do plants produce ATP when the Sun is not out?
Plants are secondary consumers.
Plants also use cellular respiration.
Plants extract ATP from the stars.
Plants are weak in the dark.
Answers
Answer:
The answer is
Plant also use cellular respiration
Answer:
B - Plants also use cellular respiration.
Explanation:
Did the test.
During a class presentation, your classmate explains that plants perform photosynthesis and animals perform cellular respiration. In your own words, describe what these processes are and explain why your classmate’s statement is correct or incorrect.
Answers
My classmate's statement in incorrect because plants are also composed of cells.
All living things are composed of cells. A cell is the smallest unit of living organisms. Cells obtain energy via the process of cellular respiration. During cellular respiration, glucose is broken down to yield carbon dioxide and water.
In photosynthesis, carbon dioxide and water are combined to form glucose. The two processes are opposites of each other. Plants produce their own food via photosynthesis. Since plants are composed of cells, plant cells also undergo cellular respiration therefore my classmate's statement in incorrect.
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How many grams are in 3.4 moles of C2H5OH molecules? (use molar mass and round answer to the correct number of sig figs)
Answers
12*2+1*5+16+1
24+5+17
46
no of moles = mass in grams/molar mass
3.4=m/46
3.4*46=m
m=156.4
m=156g
Help as soon as possible
Answers
The system from the description must be an open system. Option C
What is an open system?
An open system is one that communicates with and is influenced by its surroundings. An open system interacts with its environment by exchanging matter, energy, and information, as opposed to a closed system, which is self-contained and runs autonomously.
The idea of open systems highlights how interconnected and reliant on its environment a system is. For the analysis of system behavior, adaptability, and responses to external forces, understanding these interconnections is essential.
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4. Long answer type questions: a. b. C. d. e. f. g. h. j. i. What are the constituent gases of air? Why is the surrounding air not seen with the eyes? How do you prove that air supports burning? How do you show that air occupies space? How do you prove that air has weight? How is air useful to us? Mention any three points. Write any three properties of air. How can you say that air exerts force? Write any four effects of air pollution. Write any three causes of air pollution and any two control measures of it.
Answers
1. The constituent gases of air are:
Nitrogen Oxygen Argon Carbon Dioxide2. The surrounding air is not seen with the eyes because it is transparent. Air molecules are not visible to the na-ked eye, and they do not scatter or absorb visible light significantly. Therefore, air appears colorless and transparent.
What is air?3. To prove that air supports burning, you can perform an experiment with a burning candle. Place a glass jar or bell jar over a lit candle, ensuring that the jar is airtight. As the candle burns, it consumes oxygen from the air inside the jar. Eventually, the candle flame will go out due to the lack of oxygen, proving that air (specifically oxygen) is necessary for burning.
4. To show that air occupies space, you can perform a simple experiment using a plastic bottle or syringe. Fill the bottle or syringe with water, ensuring there are no air bubbles. Then, cover the opening tightly and try to compress the air inside. You will find that it is not possible to compress the air significantly, indicating that air occupies space.
5. To prove that air has weight, you can use a sensitive balance or scale. Weigh an airtight container or balloon, and then fill it with air. The weight of the container or balloon with the added air will be greater than its initial weight, demonstrating that air has weight.
6. Air is useful to us in various ways. Three points highlighting the importance of air are:
Breathing and RespirationCombustion and Energy ProductionClimate Regulation7. Three properties of air include:
Air is Compressible: Air can be compressed or expanded under different conditions, allowing it to fill various spaces and containers.Air has Mass: Air molecules have mass, which means air itself has weight. It exerts pressure on objects and surfaces.Air Exerts Pressure: Due to the collisions of air molecules with surfaces, air exerts pressure in all directions. This pressure is known as atmospheric pressure.Air exerts force in various ways. For example, air pressure allows objects like airplanes to fly by providing lift. Air resistance or drag opposes the motion of objects moving through the air, creating a force that can affect their speed and trajectory.
8. Four effects of air pollution include:
Respiratory ProblemsEnvironmental Damage:Climate ChangeHuman Health Impacts9. Causes of pollution:
Industrial EmissionsVehicle EmissionsResidential and Agricultural Activities10. Two control measures for air pollution include:
Emission ReductionAir Quality RegulationsLearn more about air on https://brainly.com/question/15215203
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15. Excited sodium atoms emit light in the infrared at 589 nm. What is the energy of a single photon with this wavelength?
Answers
Answer:
3.36 × 10^-19 J
Explanation:
From the formula;
E= hc/wavelength
h= 6.6 ×10^-34 Js
c= 3 × 10^8 ms-1
Wavelength= 589 ×10^-9 m
E= hc/ wavelength
E=6.6 ×10^-34 × 3 × 10^-8/ 589 ×10^-9
E= 3.36 × 10^-19 J
If you dissolved 1.6g potassium ferricyanide in 150ml of solution what would it’s concentration be in g/ml
Answers
The concentration of the solution in g/mL, given that 1.6 g of potassium ferricyanide is dissolved in 150 mL of the solution is 0.0107 g/mL
How do I determine the concentration of the soution?The concentration of solution also known as molarity of solution is defined as:
Molarity or concentation = mole / volume
However, the concentration (in g/mL) can be obtained by the following formula:
Concentation (in g/mL) = mass (in g) / volume (in mL)
Using the the above formula, we can obtain the concentration (in g/mL) as follow:
Mass of solute = 1.6 gramsVolume of solution = 150 mLConcentration (in g/mL) = ?Concentation (in g/mL) = mass (in g) / volume (in mL)
Concentation (in g/mL) = 1.6 grams / 150 mL
Concentation (in g/mL) = 0.0107 g/mL
Thus, the concentation (in g/mL) is 0.0107 g/mL
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7. In the process of assembling bicycles, you have 114 frames, 300 tires, 75 seats, 109 sets of pedals, and 84 sets of handlebars. Which is the limiting reactant in this process?
a. frames
c. seats
e. handlebars
b. tires
d. pedals
Answers
In the bicycle assembling process, the limiting reactant is seats since they will be used up first.
What is a limiting reactant?A limiting reactant is a reactant which is used up first in a reaction and on which product formation depends on.
In a given reaction, once the limiting reactant is used up, the reaction will stop.
For a bicycle to be assembled, 1 frame, 1 seat, 1 seat of handlebars, 1 seat of pedals and 2 tires are required.
In the process of assembling bicycles, there are 114 frames, 300 tires, 75 seats, 109 sets of pedals, and 84 sets of handlebars.
Therefore, the limiting reactant is seats since they will be used up first.
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To find the order of a reaction with respect to one reactant, you will monitor the as the of . is changed.
Answers
The order of reaction is defined as the power to which the concentration of the reactants are raised in the rate equation of the reaction.
The order of reaction can be used to determine how a particular reactant affects the reaction. In order to find the order of a reaction with respect to a particular reactant, the concentration of the reactant is changed while keeping the concentration of other reactants constant. The rate of reaction is then measured and compared with the rate of reaction when the concentration of the reactant is not changed.The order of reaction with respect to a reactant can be determined using the following method:First, select a reactant whose order needs to be determined and change its concentration while keeping the concentration of other reactants constant. For example, if we want to find the order of reaction with respect to reactant A, we will change the concentration of A and keep the concentration of reactant B constant.Second, measure the rate of reaction at different concentrations of the reactant A. The rate of reaction can be measured by any suitable method such as change in color, pH, or by measuring the amount of product formed with time. A graph is plotted with rate of reaction on the y-axis and concentration of reactant A on the x-axis. The graph should be a straight line.Third, if the graph is a straight line passing through the origin, the order of reaction with respect to reactant A is one. If the graph is a straight line but does not pass through the origin, the order of reaction with respect to reactant A is two. If the graph is not a straight line, the order of reaction with respect to reactant A is either zero or fractional.For such more question on concentration
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Why is it necessary to cool a hot , supersaturated solution slowly during a recrystallization?
Answers
Answer:
This is because, the is less chance of trapping impurities in the developing crystal lattice
Answer:
injuries
Explanation:
bc it will burn your hands
8. Determine the molar mass of each of these
compounds:
a) carbon monoxide, CO(g)
b) glucose, C6H1206(s)
c) magnesium hydroxide, Mg(OH)2(s)
Answers
A semipermeable membrane is placed between the following solutions. Which solution will decrease in volume?Solution A: 4 % (m/v) starchSolution B: 4.94 % (m/v) starchA semipermeable membrane is placed between the following solutions. Which solution will increase in volume?Solution C: 5.17 % NaClSolution D: 14.0 % NaCl
Answers
A semipermeable membrane is placed between the following solutions. Solution D will increase in volume.
What is volume?
Volume is a measure of the amount of space an object or substance occupies. It is most commonly measured in cubic units, such as cubic inches or cubic centimeters. Volume is a calculation of the 3-dimensional amount of space enclosed by an object or substance, and is typically found by calculating the area of one side of the object or substance and multiplying it by the object's height. Volume can be used to measure solid objects, liquids, and gases. It can also be used to measure the amount of material present in a space, such as the amount of water in a swimming pool or the amount of air in a room.
This is because the semipermeable membrane will allow the solvent (water) to move from the solution with a lower concentration of solutes (solution C) to the solution with a higher concentration of solutes (solution D), increasing the volume of solution D.
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The diagram below shows the branching tree diagram for humans. The text box below it shows the set of derived shared characteristics for the branching tree. A slanting, horizontal line is shown. On the extreme left, there is a label that says Common Ancestor. Along the slanting, horizontal line there are five dots labeled from left to right as 1, 2, 3, 4, and 5. There is one vertical line between each of the consecutive five dots. The lines are labeled from left to right as Perch, Frog, Pigeon, Rats, and Human. A text box below the branching tree diagram is labeled Derived Shared Characteristics. In the box it says from left to right, Terrestrial during all stages, Jaws, Walking on two legs, Mammary glands and hair, and Four limbs. Look at the possible derived shared characteristics, shown in the text box. Think about where these should be placed along the branching tree diagram. From the text box, select a shared derived characteristic that frogs and pigeons have. Explain why you think frogs and pigeons share this characteristic.
Answers
Based on the information provided, the shared derived characteristic that frogs and pigeons have is "Jaws."
Frogs and pigeons both belong to the vertebrate group and possess jaws. Jaws are bony structures that are essential for feeding and play a crucial role in the process of digestion. Frogs have well-developed jaws that allow them to catch and consume prey, while pigeons have a beak that serves as their modified jaw structure.
The branching tree diagram indicates that frogs and pigeons branch off at different points, suggesting that they have evolved independently from a common ancestor.
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An atomic scientist was studying an atom which through experimentation found that the total negative charge of the area surrounding the nucleus is -9. which statement corretly describes this atom? A.the atom has 9 clouds. B.the atom has 9 electrons C.the atom has 9 neutrons. D.the atom has 9 protons.
Answers
Answer:
The answer is B
Explanation:
The area surrounding the nucleus is called the electron cloud which holds the electrons, so with the power of deduction its B. 0-0
The Sun has been shining on this swimming pool all day. The water is much warmer than it was in the morning. Describe what is happening to the water in terms of temperature, particle speed, and kinetic energy.
Answers
Answer:
The waters' temp increased
Explanation:
The temperature of the water in the swimming pool has increased due to the heat from the Sun. As a result, the particles in the water are moving faster and have a higher kinetic energy than in the morning.
Which halogens are gases at STP?
Answers
As the atomic number increases, the reactivity of the halogens decreases. Fluorine and chlorine exist as gases at room temperature, while bromine is a liquid, and iodine is a solid.
Answer:
As the atomic number increases, the reactivity of the halogens decreases. Fluorine and chlorine exist as gases at room temperature, while bromine is a liquid, and iodine is a solid.
2. A graduated cylinder is filled to 25.0 mL with liquid. A solid object is added to the liquid and
the new volume is recorded at 34.2 mL. The mass of the solid object is 64.5 g. What is the
density of the solid object?
Answers
CH3 H H CH3
| | | |
CH3--- C -------C------ C -------C--CH3
| | | |
CH2 CH2 CH2 CH2
| | | |
CH3 CH3 CH3 CH3
what is the name of this compund
Answers
The systematic name of the compound is 2,2,3,3-tetramethylbutane.
What is the name of this compound ?The parent chain in this compound consists of four carbon atoms, indicated by the central chain of Cs in the diagram you provided. The prefix "but" in the name indicates that there are four carbon atoms in the parent chain.
The four methyl groups are attached to different carbon atoms in the parent chain. We can indicate the position of each methyl group by numbering the carbons in the parent chain. In this case, we can number the carbons starting from the left side of the parent chain, so that the first methyl group is attached to the second carbon, the second methyl group is attached to the third carbon, the third methyl group is attached to the second-to-last carbon, and the fourth methyl group is attached to the last carbon. This gives us the substituent groups 2,2,3,3-tetramethyl-.
Finally, we combine the parent chain name and the substituent groups to get the full name: 2,2,3,3-tetramethylbutane.
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What is the empirical formula of C6H12O6?
C2H4O2
CH2O
CH2O2
C2H4O
Answers
Answer: The empirical formula for C6H12O6 is CH2O. Every carbohydrate, be it simple or complex, has an empirical formula CH2O
Explanation:
Condensed structural formula
Answers
Answer:
Explanation: not quite sure what you are wanting but the condensed formula is
O
CH3CH2 CH
you need to put a double bond in between the C and O like in the original picture. ( like this C=O but the oxygen above the C)
Determine the mass of 4.20 moles of C6H12
Answers
Explanation:
Hope this help sweetiee
The mass of 4.20 moles of C6H12 is 352.8g
HOW TO CALCULATE MASS:
The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass. That is;mass of C6H12 = no. of moles × molar massAccording to this question, there are 4.20 moles of C6H12. The mass of C6H12 can be calculated as follows:Molar mass of C6H12 = 12(6) + 1(12) = 72 + 12 = 84g/molmass of C6H12 = 84 × 4.2mass of C6H12 = 352.8gTherefore, the mass of 4.20 moles of C6H12 is 352.8g.Learn more about how to calculate mass: https://brainly.com/question/20091306?referrer=searchResults