Acetone is a common solvent and has a density of 0.7899 g/mL. What volume of acetone, in mL has a mass of 4.15 g?

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Translate the following numbers into standard notation, maintaining the same number of significant figures.

a. 4.52 x 10^{3}

b. 8.11 x 10^{-2 }

^{}

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Consider this system at equilibrium.

PCl_{3}(g) + Cl_{2}(g) ⇌ PCI_{5}(g) + heat

How will the system respond to a temperature increase?

a. shift left

b. shift right

c. no change

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Write the equilibrium-constant expression for the reaction

2 NO(g) + O_{2}(g) ⇌ 2 NO_{2}(g)

in terms of [NO], [O_{2}], and [NO_{2}].

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Assuming equal concentrations, rank these solutions by pH.

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A monoprotic acid, HA, is dissolved in water:

HA ⇌ H^{+} + A^{-}

The equilibrium concentrations of the reactants and products are

[HA] = 0.240 M

[H^{+}] = 2.00 x 10^{-4} M

[A^{-}] = 2.00 x 10^{-4} M

Calculate the value of pK_{a} for the acid HA.

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A student measures 49.9 mL of concentrated nitric acid, which has a density of 1.50 g/mL.

What is the mass of the acid? Express your answer in grams to three significant figures.

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Write the chemical symbols for three different atoms or atomic cations with 26 electrons.

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A carbon-hydrogen bond in ethane (CH_{3}CH_{3}) is best described as

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In the compound sodium methoxide (NaOCH3), there is ___ bonding

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**Question 3**

What is the pH of a 0.500M strontium hydroxide solution?

**Question 4**

Calculate the pH of a 0.250M formic acid (HCOOH) solution. K_{a} for formic acid is 1.8 x 10^{-4}.

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**Question 2**

Calculate the pH of a solution with [OH^{-}] equal to 2.9 x 10^{-4} M.

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[OH^{-}] = 5.5 x 10^{-9} M

Express the molarity to two significant figures.

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Given that 8.33 moles of carbon monoxide gas are present in a container of volume 26.10 L, what is the pressure of the gas (in atm) if the temperature is 47°C?

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A glucose solution contains 58.5 g of glucose (C_{6}H_{12}O_{6}) in 460 g of water.

**Part A**

Compute the freezing point and boiling point of the solution. (Assume a density water.)

**Part B**

Compute the freezing point and boiling point of the solution. (Assume a density water.)

Express your answer using six significant figures.

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Given the following acids and K_{a} values:

HClO_{4} HOAc HCN HF

1 x 10^{7} 1.76 x 10^{-5} 4.93 x 10^{-10} 3.53 x 10^{-4}

What is the order of increasing base strength?

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What is the volume of 5.37 moles of an ideal gas at 35.5°C and 1.00 atm?

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Consider the reaction:

2NiO (s) → 2Ni (s)+ O_{2} (g)

Oxygen gas is collected over water at 40.0°C and a barometric pressure of 745 torr. What volume of oxygen will be collected for the complete reaction of 24.8 g NiO?

You must show the key steps in the calculation to get the full credit even for the correct answer.

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Give the SYSTEMATIC name for each of the following compounds:

(a) Hg_{2}(OH)_{2}

(b) CrO_{3} [Cr = Chromium]

(c) H_{2}SO_{3} (aq)

(d) HClO_{3} (aq)

(e) Fe_{3}N_{2}

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The value of K_{c} for the reaction:

N_{2}O_{4} (g) ⇌ 2NO_{2} (g)

is 0.53 at 461.5 K.

**Part 1 **

If a reaction vessel at that temperature initially contains 0.0251 MNO_{2} and 0.0251 MN_{2}O_{4}, what is the concentration of NO_{2} at equilibrium?

**Part 2**

What is the concentration of N_{2}O_{4 }at equilibrium?

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How many grams of carbon disulfide are needed to completely consume 53.3 L of chlorine gas according to the following reaction at 25°C and 1 atm?

carbon disulfide (s) + chlorine (g) → carbon tetrachloride (l) + sulfur dichloride (s)

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0.976 mol sample of helium gas at a temperature of 24.0°C is found to occupy a volume of 21.2 liters. The pressure of this gas sample is ___ mm Hg.

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A sample of argon gas collected at a pressure of 626 mm Hg and a temperature of 287 K has a mass of 28.1 grams. The volume of the sample is ____ L.

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A sample of helium gas collected at a pressure of 0.976 atm and a temperature of 24.0°C is found to occupy a volume of 21.2 liters. How many moles of He gas are in the sample?

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A sample of argon gas collected at a pressure of 0.702 atm and a temperature of 291 K is found to occupy a volume of 653 millimeters. How many moles of Ar gas are in the sample?

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