Which equation is correct if the
volume of a block is 64 cm3?
A. 5 cm x 5 cm x 5 cm = 64 cm3
B. 8 cm x 4 cm x 2 cm = 64 cm3
C. 5 cm + 5 cm + 5 cm = 64 cm3
D. 8 cm + 4 cm + 2 cm = 64 cm3

The vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane the vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane is 164.83 torr.

The term vapor pressure is defined as the tendency of a material to change into the vapour state, and it increases with temperature.

For calculating mole fraction of C₂H₄Br₂ as follows

X C₂H₄Br₂ = moles of C₂H₄Br₂ / moles of C₂H₄Br₂ + moles of C₃H₆Br₂

= 0.3 / 0.3 + 1.80

= 0.14

For calculating mole fraction of C₃H₆Br₂ as follows:

XC₃H₆Br₂ =  moles of C₃H₆Br₂ / moles of C₂H₄Br₂ + moles of C₃H₆Br₂

= 1.80 / 2.1

= 0.85

For calculating total vapor pressure as follows:

P total = [ ( 0.14 × 127) + (0.85 × 173) ]

= 17.78 + 147.05

= 164.83 torr

Thus, The vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane the vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane is 164.83 torr.

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Answer:

I guess option \(b) \:CCl_4\)  is the correct choice.

Explanation:

Carbon tetrachloride \((CCl_4)\) is a non-polar solvent. Therefore, the non-polar substance will be most soluble in \(CCl_4\).

Best Regards!

How many mL of a 0.10 M NaOH solution are needed to neutralize 15 mL of 0.20 M H3PO4?

  5.0 (328)

Ph. D. in organic chemistry with 6+ years of teaching experi..

Write down the balanced reaction first

3NaOH + H3PO4   makes    Na3PO4 + 3H2O

Given 0.10M NaOH (0.10mol/lit NaOH)

0.2M H3PO4 ( 0.2 mol/lit H3PO4)

15 ml of H3PO4 or 0.015 lit of H3PO4

Find volume of NaOH needed to neutralize the solution

Relate moles of H3PO4 with the moles of NaOH with the helps of coefficients in front of NaOH and H3PO4 seen in balanced equations.

               moles ↔ Litre use definition of molarity (moles/litrs)

Start with what is given for H3PO4

0.015 lit of H3PO4 x 0.2 moles of H3PO4 / lit of H3PO4 x 3 moles of NaOH/1 mole of H3PO4 x lit of NaOH/0.1 mol of NaOH = 0.09 lit or 90 ml.

The same colors in above equations cancel our leaving lit of NaOH as final answer.

Art Nouveau is perhaps the first historical artistic movement that comes to mind when thinking about the Neo-Traditional style and japan.

Thus, in order to comprehend Art Nouveau, one must first comprehend the context and symbolism that led to the development of the style.

Japan has cut off communication with the rest of the world by 1603. The floating world was determined to defend and preserve its culture, which was under severe attack from outside powers.

To debate the opening of Japan's heavily guarded gates, forty Japanese officials were dispatched to Europe in 1862, more than 250 years later. Goods from the two countries started to transcend oceans and lands to eagerly awaiting fingertips in order to reduce tensions between the countries and maintain stable Japan.

Thus, Art Nouveau is perhaps the first historical artistic movement that comes to mind when thinking about the Neo-Traditional style and japan.

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Answer: anhydrous CaCl 2 :0H 2 O

monohydrate CaCl 2 :1H 2 O

a di-hydrate CaCl 2 :2H 2 O

Explanation:

The concentration of H₂SO₃ solution is equal to 0.123 M.

A neutralization reaction is described as a reaction in which an acid and base react to form salt and water. When a strong acid will react with a base then the salt which is formed can be neither acidic nor basic.

When H₂SO₃ (a strong acid) reacts with KOH, the resulting salt is K₂SO₃  and water.

H₂SO₃  +  2KOH   →   K₂SO₃  +   2H₂O

Given, the concentration of KOH = 0.235 M

The volume of the KOH = 65.25 ml = 0.06525 L

The number of moles of KOH, n = M × V = 0.235 × 0.06525 = 0.0153 M

The volume of the  H₂SO₃ = 62.4 ml = 0.0624 L

The number of moles of  H₂SO₃, n = 0.0153/2 = 0.00767 mol

The concentration of H₂SO₃ =0.00767/0.0624 = 0.123 M

Therefore, the molarity of  H₂SO₃ is 0.123 M.

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The molarity of the NiSO₄ solution made by dissolving 38.81 grams of nickel (ii) sulfate, NiSO₄, in enough water to make 0.467 liters of solution is 0.535 M

First, we shall obtain the mole of 38.81 grams of nickel (ii) sulfate, NiSO₄. Details below:

Mole of NiSO₄ = mass / molar mass

= 38.81 / 154.75

= 0.25 mole

Now, we shall determine the molarity of the solution. Details below:

Molarity of solution = mole / volume

= 0.25 / 0.467

= 0.535 M

Thus, the molarity of the solution is 0.535 M

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Answer:

2.7 moles of solute per 1000 mL of solution.

Explanation:

Hello,

In this case, molarity is defined as the ratio of the moles of the solute to the volume of the solution in litres, thus, for a 2.7-M solution, it is clear that we have 2.7 moles of the solute in 1 L of solution, thus the option having the proper relation is 2.7 moles of solute per 1000 mL of solution as 1 L equals 1000 mL.

Best regards.

Answer) It does not conduct electricity in any form. Consider the location of barium, chlorine, iodine, and strontium on the periodic table.  It conducts electricity when it is dissolved in water.

I hope it is helpful

Answer:

Explanation:

Given species;

  Beryllium

  Calcium

   Sulfur

Unknown:

Give the symbol, number of neutrons and the mass number

Solution:

The symbols of the species are;

    Beryllium  -   Be

    Calcium     -  Ca

     Sulfur       -  S

Number of neutrons:

    Beryllium - 5

   Calcium    - 20

   Sulfur       -  16

Mass number :

  Beryllium - 9

    Calcium - 40

     Sulfur -    32

There are 2 electrons in the overlapping region.

Chlorine is the second member of the halogen group which are form of family of elements that resemble one another very closely.

The electronic configuration of chlorine shows the arrangement of chlorine electrons within it's atom.

At the outer most shell of the atom is seven electrons, therefore requires only one electron each to attain the octet arrangement.

The overlapping of the orbitals indicates the chemical bond formed by sharing of electrons between atoms called covalent bonding.

To complete it's outer most shell, it will need to share electron with another chlorine atom.

Therefore, there are 2 electrons in the overlapping region.

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The pH value of 500 mL of an aqueous solution of 0.005 mole HCl is 2

We'll begin our calculations by obtaining the molarity of the solution. Details below:

Molarity = mole / volume

Molarity = 0.005 / 0.50

Molarity = 0.01 M

Next, we shall obtain the concentration of the hydrogen ion, H⁺ in the solution. Details below:

HCl(aq) <=> H⁺(aq) + Cl¯(aq)

From the balanced equation above,

1 mole of HCl contains 1 mole of H⁺

Therefore,

0.01 M HCl will also contain 0.01 M H⁺

Thus, the concentration of the hydrogen ion, H⁺ in the solution is 0.01 M

Finally, we shall determine the pH of the solution. Details below:

pH = -Log H⁺

pH = -Log 0.01

pH = 2

Thus, we can conclude that the pH of the solution is 2

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The compound has an empirical formula of \(K_2H_2P_2O_8\) and a molecular formula of \(K_2HPO_4\).

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The correct question would be as

The composition of a compound is 28.73% K. 1.48% H, 22.76% P, and 47.03% O. The molar mass of the compound is 136.1 g/mol. What is the Molecular Formula of the compound?

\(KH_2PO_4\\KH_3PO_4\\K_2H_4P_20_{12}\\K_2H_3PO_6\)

Answer:

I think the dish contracts and shrinks

Answer:

The dish cracks or breaks.

Explanation:

When glass changes temperature rapidly, it may undergo thermal shock. This is stress that is produced by a sudden change in temperature.

1.4.1 An exothermic reaction releases energy in the form of heat or light.

1.4.2 An exothermic reaction releases more energy than it absorbs due to the higher potential energy of the reactants compared to the products.

1.5.1 Effective collision requires sufficient energy or activation energy.

1.5.2 Increasing the concentration of sodium hydroxide solution increases the rate of reaction with aluminum due to more frequent effective collisions.

1.6  Increasing the pressure would not affect the rate of the reaction between sodium hydroxide and aluminum.

1.4.1 Exothermic reaction: An exothermic reaction is a chemical reaction that releases energy in the form of heat or light, resulting in an overall decrease in the internal energy of the system.

1.4.2 In an exothermic reaction, the energy released as a result of the reaction is greater than the energy absorbed. This is because the reactants have a higher potential energy compared to the products. The excess energy is released to the surroundings, leading to an overall decrease in the system's internal energy.

1.5.1 One condition for an effective collision is the presence of sufficient energy, often referred to as activation energy. The reacting particles must possess enough energy to overcome the activation energy barrier for successful collision and reaction to occur.

1.5.2 According to collision theory, increasing the concentration of a reactant, such as sodium hydroxide (NaOH) in its reaction with aluminum (Al), would increase the rate of reaction. A higher concentration provides more particles per unit volume, resulting in more frequent collisions and an increased chance of effective collisions.

1.6 An increase in pressure (at constant temperature) would not significantly affect the rate of the reaction between sodium hydroxide and aluminum. The reaction rate is primarily dependent on the concentration of the reactants and the frequency of effective collisions, rather than the pressure. Therefore  the rate would remain the same.

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1.) Chemist needs 79.02 g of KMnO4 to make 4.00 L of a 0.50 M solution. 2.)  You will need to use 0.12 L of 1.50 M solution to make 2.40 L of 0.0750 M solution. 3.) Solution has a molality of 0.00229 mol/kg.

Molality is defined as a measure of number of moles of solute in a solution corresponding to 1 kg or 1000 g of solvent.

1.) As, mass = moles x molar mass

Molar mass of KMnO4 is 158.03 g/mol

So, mass = 0.50 mol x 158.03 g/mol = 79.02 g

Therefore, the chemist needs 79.02 g of KMnO4 to make 4.00 L of a 0.50 M solution.

2.)As , C1V1 = C2V2

Here C1 is initial concentration, V1 is initial volume, C2 is final concentration and V2 is the final volume.

1.50 M x V1 = 0.0750 M x 2.40 L

Now, V1 = (0.0750 M x 2.40 L) / 1.50 M

So, V1 = 0.12 L

You will need to use 0.12 L of the 1.50 M solution to make 2.40 L of the 0.0750 M solution.

3.) Formula for molality is: m = (moles of solute) / (kg of solvent)

As, moles = (mass of solute) / (molar mass of solute)

= (20 g) / (58.44 g/mol) = 0.344 mol

m = (0.344 mol) / (150 g / 1000 g/kg) = 0.00229 mol/kg

So, the solution has a molality of 0.00229 mol/kg.

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Matter of the substance is the mass and takes up space, volume . .The physical properties of matter is the that determine without changing chemical identity.

The  properties of matter is of two types : the physical property and the chemical property . A physical properties of matter is the property that can be determined without changing their chemical identity of a substance. example : density , color, mass , volume , length,  etc. the physical properties are of two types : intensive physical properties and the extensive physical properties.

The chemical properties of that that can be determine by the changing the chemical identity of substance. example : toxicity, heat, enthalpy, flammability.

Thus, Matter of the substance is the mass and takes up space, volume .The physical properties of matter is the that determine without changing chemical identity.

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Answer:

A small amount of chemical splashes in Frank's eye. What should happen next? Frank should go to the eyewash station while his lab partner tells the teacher what happened.

Explanation:

Brainlist

I apologize of I'm wrong but its probably OA

Sorry once again!

~wise rat

Answer: C.

Explanation:

gasoline evaporating into the air

Pollutants of many different forms enter the environment as a result of chemical interactions in daily living. Significant soil pollution has been brought on by mining, agriculture, and waste disposal.

Chemical pollution is the act of contaminating the environment with chemicals that do not occur naturally.

The delicate ecosystems of the Earth's surface can be harmed by chemical pollution. Biodiversity and population food production are both impacted by soil health. Marine biodiversity has also been impacted by high or prolonged chemical exposure

The diversity of animals, plants, fungi, and even microbes like bacteria that make up our ecological landscape are all included in what is known as biodiversity.

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Answer:

the pig's average speed is 7 m/s

The average speed of a moving body is the ratio of the distance travelled to the time of travel. Here, the speed of the pig running 46 meters in 6 seconds is 7.6 m/s.

The speed of an object is a physical quantity that measures the distance travelled by the object per unit time. Hence, it is the ratio of distance travelled to the  time taken for the travel. The rate of speed is called velocity. Bot are having the standard unit of m/s.

Given that,

distance covered by the pig = 46 meters

time taken = 6 seconds

speed  = distance/time.

Average speed of the pig = 46 meters/ 6 seconds = 7.6 m/s.

Therefore, if the small pig runs 46 meters in 6 seconds, it is having an average speed of 7.6 m/s.

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The moles of Cl₂(g) will be present at equilibrium is 3.94 × 10⁻⁴ mol

To determine the number of moles of Cl₂(g) at equilibrium, we need to use the given equilibrium constant (Kₑ) and the initial concentrations of CO(g) and COCl₂(g).

Given:

[CO(g)] = 0.3500 mol

[COCl₂(g)] = 0.05500 mol

Kₑ = 1.2 × 10²

The balanced equation for the reaction is:

CO(g) + Cl₂(g) ⇌ COCl₂(g)

Let's denote the number of moles of Cl₂(g) at equilibrium as x. At the start, we have [Cl₂(g)] = 0 mol, but it will change by x at equilibrium.

Using the equilibrium expression, we can write:

Kₑ = [COCl₂(g)] / ([CO(g)] * [Cl₂(g)])

Plugging in the values:

1.2 × 10² = [COCl₂(g)] / (0.3500 * [Cl₂(g)])

To solve for [Cl₂(g)], we need to isolate it on one side of the equation:

[Cl₂(g)] = [COCl₂(g)] / (0.3500 * Kₑ)

Now, let's substitute the given values:

[Cl₂(g)] = 0.05500 / (0.3500 * 1.2 × 10²)

[Cl₂(g)] ≈ 3.94 × 10⁻⁴ mol

Therefore, approximately 3.94 × 10⁻⁴ moles of Cl₂(g) will be present at equilibrium.

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The question was Incomplete, Find the full content below:

Starting with 0.3500 mol CO(g) and 0.05500 mol COCl₂(g) in a 3.050-L flask at 668 K, how many moles of Cl₂(g) will be present at equilibrium

CO(g) + Cl₂(g) ⇄ COCl₂(g)  Ke 1.2 x 10^{2} at 668 K

Step 1: Let's transform mg into grams.

To do that, we need to divide 465.65 by 1000:

0.46565 g

Step 2: Transform grams to moles using the following formula: moles = mass/molar mass

molar mass of gold is 196.96657 g/mol (look at the periodic table)

moles = 0.46565/196.96657

moles = 2.3641 x 10^-3 moles

Step 3: to transform to atoms, we need to use avogadro's constant:

6.022 x 10^23 atoms --- 1 mol

x --- 2.3641 x 10^-3 moles

x = 2.3641 x 10^-3 * 6.022 x 10^23

x = 1.4237 x 10^21 atoms

Answer: 2.3641 x 10^-3 moles and 1.4237 x 10^21 atoms

Answer:

0.032 mole

Explanation:

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Na is for sodium and SO4 is sulfate...

Answer: The chemical compound name for Na₂SO₄ is Sodium Sulfate.

Answer:

Octane is a hydrocarbon and an alkane with the chemical formula C 8 H 18, and the condensed structural formula CH 3 (CH 2) 6 CH 3.Octane has many structural isomers that differ by the amount and location of branching in the carbon chain. One of these isomers, 2,2,4-trimethylpentane (commonly called iso-octane) is used as one of the standard values in the octane rating scale.

Chemical formula: C₈H₁₈

Molar mass: 114.232 g·mol−1

Melting point: −57.1 to −56.6 °C; −70.9 to −69.8 °F; 216.0 to 216.6 K

Solubility in water: 0.007 mg dm−3 (at 20 °C)

Answer:

Explanation:

Octane is C8H18, carbon is C. Therefore, for every mol of C8H18 there will be 8 mols of carbon.

Convert 20 kg of octane to mols octane using molar mass of octane.

Molar Mass octane = (8*12.011)+(18*1.008)=114.23 g/mol, where 8 and 18 are the atoms in the molecule and 12.011 and 1.008 are the respective molar masses of carbon and hydrogen.

20kg C8H18 *1000g/kg * mol C8H18/114.23g C8H18 = 175.1 mols octane.

Now convert that number of mols to mols carbon:

175.1 mol C8H18 * (8 mol C/mol C8H18)=1400.8 mol C.

Now remember that a mol of any given atom=6.022*10^23 atoms.

So 1400.8 mol C=1400.8*(6.022*10^23) atoms C, which is equal to your final answer, 8.4*10^26 atoms. (round to 2 significant digits since the initial number given, 20, has 2 significant digits.)

The main thing you want to look for here is your conversion factors. Once you have those down it is simple algebra from there, so be sure to practice those!