what is the maximum amount of heat in joules that 23 grams of water at 95oc can lose before freezing completely?

A 1.00 L sample of a gas has a mass of 1.7 g at STP. The molar mass of the gas is approximately 41.6 g/mol, which is closest to option (c) 38 g/mol.

To solve this problem, we can use the ideal gas law:

PV = nRT

where P is the pressure,

V is the volume,

n is the number of moles of gas,

R is the ideal gas constant,

and T is the temperature.

At STP (standard temperature and pressure), the pressure is 1 atm and the temperature is 273 K. We also know the volume of the gas is 1.00 L and the mass of the gas is 1.7 g.

First, we can convert the mass of the gas to moles using its molar mass:

moles = mass / molar mass

Since we don't know the molar mass yet, let's call it "M":

moles = 1.7 g / M

Next, we can use the ideal gas law to find the number of moles of gas:

PV = nRT

n = PV / RT

n = (1 atm)(1.00 L) / (0.08206 L atm/mol K)(273 K)

n = 0.0409 mol

Now we can equate the two expressions for the number of moles of gas:

1.7 g / M = 0.0409 mol

Solving for M, we get:

M = 1.7 g / 0.0409 mol

   = 41.6 g/mol

Therefore, the molar mass of the gas is approximately 41.6 g/mol, which is closest to option (c) 38 g/mol.

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Answer:

food doesn't spoil as fast when it is refrigerated because  it would be at  room temperature. Because of the lowered temperature, there are less collisions, which slows down the reaction! Due to decomposition reactions with oxygen or carbon dioxide in the air, meat begins to feel slimy and smell spoiled.  and member mark me as brainliest

Answer:

A lower temperature slows down the reactions in the food because there are less collisions. The chemical breakdowns and microorganism activity can't work as fast as it used to because of the cold.

O3 is called as Ozone. There are two resonance structure in O3 that contribute equally to the overall hybrid structure of the molecule.

Resonance structures can be drawn in different ways. In resonance structures, one can only change the location of bonds and electron pairs and not the amount or type of atoms. Ozone is an inorganic molecule with the formula O₃. Ozone is a pale blue gas with a distinctively pungent smell. It is an allotrope of oxygen that is much less stable than the diatomic allotrope O₂. That breaks down in the lower atmosphere to O₂. It  is used in many industries. Ozone is used for purifying air and drinking water in industrial waste treatment, oils, bleaching and waxes and to make other chemicals. Two resonance structures can be drawn for ozone. The location of the double bond changes in the structure. Both the resonance structures of ozone are stable.

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Answer:

The right answer is "236.53 g".

Explanation:

The given values are:

P = 1.09 atm

V = 186 liters

The reaction will be:

⇒  \(KClO_3 (s)\rightarrow 2Kcl(s)+3O_2(g)\)

The moles of O₂ will be:

=  \(\frac{PV}{RT}\)

On substituting the values, we get

=  \(\frac{1.09\times 186}{0.0821\times 850}\)

=  \(\frac{202.47}{69.785}\)

=  \(2.90 \ moles\)

Now,

1 mole O₂ is produced from

= \(\frac{2}{3} \ mol \ KClO_3\)

then,

2.90 mole O₂ is produced from 2 mol KClO₃

= \(\frac{2}{3}\times 2.90\)

= \(1.93 \ mol \ KClO_3\)

hence,

The number of grans of solid in the engine will be:

= \(1.93\times 122.55\)

= \(236.53 \ g\)

The smallest unit of life that can sustain itself is called an organism.

An organism is a living entity that is composed of one or more cells, which are the basic structural and functional units of life. These cells are capable of carrying out all the necessary processes for the organism's survival, including metabolism, growth, reproduction, and response to stimuli. An organism can exist as a single-celled or multi-celled entity, and can range in size from microorganisms like bacteria to large mammals like elephants. The biosphere is the term used to describe the global ecological system that encompasses all living organisms and their interactions with each other and their physical environment. A population is a group of individuals of the same species living in a specific geographic area.

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The dependent  variable is the time taken, the independent variable is the type of paper helicopter and the control is the height from which the paper helicopters are dropped.

The term experiment helps us to decode the relationship between two variables. We have to know that in an experiment we are able to establish cause and effect relationships.

The dependent variable is the variable that is changed owing to the fact that another variable (the independent variable) is manipulated in the experiment.

Now, the dependent  variable is the time taken, the independent variable is the type of paper helicopter and the control is the height from which the paper helicopters are dropped.

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This problem is providing statements whereby an student is pretending to explain a wrongly-classified non-redox reaction via the change in the oxidation numbers the elements undergo as it takes place. It is asked to report where the student went wrong and to determine whether the reaction is redox or not.

In such a way, we can start by saying that the student was right about the +1 on H and -1 on I but just on HI, not on the diatomic gases too, because when the elements act alone in a chemical equation, their oxidation states must be 0 as they are not forming any ions.

Next, we can go over the identification of the reaction as redox, by writing the correct oxidation numbers in the considered chemical equation:

\(I_2^0(g)+H_2^0(g)\rightleftharpoons 2H^+I^-(g)\)

Which exhibits an oxidation half-reaction for hydrogen because it changed from 0 to +1 and a reduction half-reaction for iodine because it changed from 0 to -1, and thus, when the oxidation numbers change, we say the reaction is redox.

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Total volume of the solution formed will be 32.5 liters

Given:

Molarity of solution = 0.0200 m

mass of nacl = 38.0 grams

To Find:

total volume of the solution

Solution: Molarity is defined as the amount of solute present in 1 L of solution. The equation used to determine molarity of the solution follows:

M = given mass of nacl/molar mass of nacl*1/volume of solution

volume of solution = given mass/molar mass*1/molarity

volume = 38/58.5*1/0.02 = 32.5

Hence, volume of solution = 32.5 litres

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Answer: The concentration of given solution is 11.68 M.

Explanation:

Given: Mass of solute = 10 g

Volume of solution = 25 mL

Convert mL into L as follows.

\(1 mL = 0.001 L\\25 mL = 25 mL \times \frac{0.001}{1 mL}\\= 0.025 L\)

Number of moles is the mass of substance divided by its molar mass. The moles of sugar (molar mass = 342.3 g/mol) is as follows.

\(No. of moles = \frac{mass}{molar mass}\\= \frac{10 g}{342.3 g/mol}\\= 0.0292 mol\)

Molarity is the number of moles of solute present in a liter of solution.

Hence, concentration of given solution is calculated as follows.

\(Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.0292 mol}{0.025 L}\\= 11.68 M\)

Thus, we can conclude that the concentration of given solution is 11.68 M.

Answer:

Soap

Explanation:

Answer:

make reclamation compulsory after bauxite has been removed

Explanation:

Available options:

choose other infertile and uninhabited locations for bauxite mining

allow agriculture and mining to take place simultaneously in the location

ask farmers in the location to help in mining bauxite

make reclamation compulsory after bauxite has been removed

The correct option and the best plan to solve the problem of permanent dislocation of farmers would be to make reclamation compulsory after the bauxite has been removed.

Reclamation would involve restoring the agricultural land back to its original status prior to the commencement of bauxite mining. By doing this, the farmers can return to their farmland after being temporarily displaced due to the mining activities.

answer is b

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The both can be separated by adding water to the mixture.

Diamonds and sugar are two very different substances, and it is relatively easy to separate them from each other using physical and chemical methods.

One common method to separate diamonds from sugar is by using their different physical properties. Diamonds have a much higher density than sugar, so if you mix a sample of both substances in water, the diamonds will sink to the bottom while the sugar will float on top and dissolve in the water. This is known as gravity separation.

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The temperature of the gas after it is cooled from 260°C to a volume of 75.0L would be approximately 296 K or 23°C.

The temperature and volume of a gas are directly proportional, as described by the ideal gas law. The ideal gas law states that the pressure, volume, and temperature of a gas are related by the equation PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in Kelvin.

To determine the temperature of the gas after it is cooled from 260°C to a volume of 75.0 L, we can use the following formula:

T1/T2 = V1/V2

Where T1 and V1 are the initial temperature and volume, and T2 and V2 are the final temperature and volume.

Converting the initial temperature of 260°C to Kelvin gives us T1 = 533 K, and the initial volume of 135 L is V1 = 135 L. The final volume is given as V2 = 75.0 L.

Therefore, T2 = (V2/V1) x T1 = (75.0 L/135 L) x 533 K = 296 K.

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Subatomic particles that cause the mass of an atom to change are called isotopes. Isotopes are atoms of the same element that have an unequal number of neutrons in their nuclei.

This difference in the number of neutrons causes the mass of the atom to vary. For example, the most common form of carbon is Carbon-12, which has an atomic mass of 12 and contains 6 protons and 6 neutrons, while Carbon-14 has an atomic mass of 14 and contains 6 protons and 8 neutrons. The extra two neutrons make Carbon-14 slightly heavier than Carbon-12. The number of neutrons in an atom is determined by the number of protons and the element's atomic number, so when the number of neutrons changes, the mass of the atom changes as well. Isotopes can be naturally occurring or artificially created, and their properties may vary depending on the number of neutrons in the nucleus. Overall, isotopes are subatomic particles that cause the mass of the atom to change.

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The element with lowest electronegativity, based on periodic trends, is Li. An atom's electronegativity is measured.

Atomic radius, ionisation energy, electron attraction, electronegativity, valency, and metallic nature are important periodic trends. Due to the periodic nature of the elements and their similar electrical configurations within their various groups or periods, these tendencies are present.

The number of protons on the nucleus, the number of energetic levels, & the shielding effect are three variables that aid in the prediction of trends in the periodic table. In any group, the atomic radii get larger from top to bottom.

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Answer:

c

Explanation:

its the only one with a downside to solar and wind.

The amount of compound B required for the drug is 128.7 ml.

What is the reason for this?

The comparison of the two compounds(i.e., compound A and B) implies that the compounds are represented as a ratio of the amount of one compound to the other.

According to the given question:

Given the following ratio

A:B = 5:3

Mixture: 472mL

To calculate the amount of compound B required, we use the following formula:

B= B ratio/ A ratio + B ratio * Mixture

This gives us,

B= 3/8+3 * 472 ml

B= 3/11 * 472 ml

B= 128.7 ml

Therefore, the amount of compound B required for the drug is 128.7 ml.

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The equation for lactic fermentation after glycolysis is:

           pyruvic acid + NADH → lactic acid + NAD⁺

Skeletal muscles are where lactic acid fermentation takes place. When there is not enough oxygen, lactate dehydrogenase converts pyruvate to lactic acid. Lactic acid accumulation in the muscles causes fatigue. Muscle cells and other bacterial and animal cells engage in a type of anaerobic fermentation.

The metabolic process known as lactic acid fermentation turns glucose or other six-carbon sugars into the metabolite lactate, which is the lactic acid in solution, and cellular energy.

The creation of many food products involves the bacterial process known as lactic fermentation. It serves a critical function in food safety by giving the finished products distinctive scents and textures.

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Answer:

15.68 Joules

Explanation:

In physics, work is defined as the energy that is transferred to or from an object by a force that displaces that object some distance.  The SI unit for work is a Joule, which itself is defined as 1 kg*m^2/s^2.

The attached file explains the steps to cacluate work done in raising the 2 kg book 0.8m.

Answer:

-1670.24 kJ

QUICK Explanation:

ΔH * moles of limiting reactant  = Energy produced

-572 kJ/mol * 2.92 moles of O2 = -1670.24 kJ

LONGER EXPLANATION :

2 H2 + O2 -> 2 H2O

ΔH * moles of limiting reactant  = Energy produced

enthalpy change or heat of reaction formula

1. Calculate the number of moles of oxygen (O2):

  Number of moles = mass / molar mass

  Number of moles of O2 = 93.5 g / 32.00 g/mol

                      ≈ 2.92 mol O2

2. Calculate the number of moles of hydrogen (H2):

  Number of moles = mass / molar mass

  Number of moles of H2 = 13.2 g / 2.02 g/mol

                      ≈ 6.53 mol H2

3. Determine the limiting reactant:

  According to the balanced equation,

  2 moles of H2 react with 1 mole of O2.

  Calculate the moles of O2 based on the moles of H2:

  (6.53 mol H2) / (2 mol H2/O2) = 3.27 mol O2

we need 3.27 mol O2  to react with the available H2

BUT only have 2.92 mol of O2 available

O2 is the limiting reactant

4.

Calculate the heat given off by assuming the complete consumption of the limiting reagent

calculate the amount of energy produced using the given enthalpy change (ΔH):

Energy produced = ΔH * moles of limiting reactant

Energy produced = ΔH * moles of O2 reacted

Calculate the energy produced using the given enthalpy change (ΔH):

  Energy produced = ΔH * moles of O2 reacted

                 = -572 kJ/mol * 2.92 mol

                 ≈ -1670.24 kJ

Therefore, approximately -1670.24 kJ of energy is produced when 93.5 grams of oxygen react with 13.2 grams of hydrogen in the given reaction. Note that the negative sign indicates that the reaction is exothermic (energy is released).

chatgpt

Answer:

Some examples of quantitative data include:

Revenue in dollars.

Weight in kilograms.

Age in months or years.

Length in centimeters.

Distance in kilometers.

Height in feet or inches.

Number of weeks in a year.

Qualitative data describes qualities or characteristics. It is collected using questionnaires, interviews, or observation, and frequently appears in narrative form. For example, it could be notes taken during a focus group on the quality of the food at Cafe Mac, or responses from an open-ended questionnaire

Explanation:

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Answer:

2.15-1.85=0.3.

so therefore.

0.3/2.15×100

=13.953 ~ 14.

Answer:

See explanation

Explanation:

In Rutherford's experiment, a gold foil was bombarded with positively charged alpha particles. A zinc sulphide screen was used to observe the movement of the alpha particles during the experiment.

A few particles passed through without deflection while some particles were deflected through large angles.  This observation led Rutherford to the conclusion that the atom was made up of a dense positively charged nucleus where most of its mass was concentrated.

The ratio between the maximum and minimum sound intensities that produce a particular loudness is known as the dynamic range.

The specific ratio can vary depending on the loudness level and the individual's perception.For example, the dynamic range for a loudness level of 60 dB may be around 1,000 to 1, meaning the maximum sound intensity is 1,000 times louder than the minimum sound intensity required to produce that loudness level.

However, in general, the dynamic range for human hearing is estimated to be around 120 decibels, meaning that the loudest sound we can tolerate is around 120 dB greater than the quietest sound we can hear.

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Answer:

n = 0.1624 moles

Explanation:

\(n=\frac{m}{M} \\n=\frac{52.5}{323.1937} \\n= 0.1624 mol\)

Answer: It is a molecular compound. (2) It contains a metal. (3) It can conduct electricity as a solid.