# Chemistry Questions

**Question description**

1. A prevailing pressure of one standard atmosphere will support a column of mercury 760 mm in height. Liquid **carbon tetrachloride** has a density of **1.59** g/mL. The height of a column of **carbon tetrachloride** that one standard atmosphere can support is ______ mm.

The density of liquid mercury is 13.6 g/mL.

2. Liquid **methylene chloride** has a density of **1.33** g/mL. A barometer is constructed using **methylene chloride** instead of mercury. If the atmospheric pressure is **0.952** atm, what is the height of the **methylene chloride** column in the barometer in cm?

The density of liquid mercury is 13.6 g/mL.

3. A sample of **oxygen** gas occupies a volume of **9.58** L at **46** °C and **0.638** atm.

If it is desired to **increase** the volume of the gas sample to **12.1** L, while **decreasing** its pressure to **0.413** atm, the temperature of the gas sample at the new volume and pressure must be _____ °C.

4. A sample of gas contains **0.1400** mol of **H _{2}(g)** and

**7.000E-2**mol of

**O**and occupies a volume of

_{2}(g)**7.05**L. The following reaction takes place:

**2**

**H**+

_{2}(g)**O**

_{2}(g)--->**2**

**H**

_{2}O(g)Calculate the volume of the sample after the reaction takes place, assuming that the temperature and the pressure remain constant.

5. A sample of gas contains **0.1100** mol of **CH _{4}(g)** and

**0.2200**mol of

**O**and occupies a volume of

_{2}(g)**11.9**L. The following reaction takes place:

**CH**+

_{4}(g)**2**

**O**

_{2}(g)--->**CO**+

_{2}(g)**2**

**H**

_{2}O(g)Calculate the volume of the sample after the reaction takes place, assuming that the temperature and the pressure remain constant.

6. A sample of **oxygen** gas collected at a pressure of **0.851** atm and a temperature of **29.0** °C is found to occupy a volume of **28.1** liters. How many moles of **O _{2}** gas are in the sample? _____ mol

7.

A sample of **helium** gas collected at a pressure of **0.578** atm and a temperature of **297** K is found to occupy a volume of **530.** milliliters. How many moles of **He** gas are in the sample?

8. A sample of **helium** gas collected at a pressure of **797** mm Hg and a temperature of **277** K has a mass of **2.31** grams. The volume of the sample is _____ L.

9. According to the ideal gas law, a **0.9150** mol sample of **nitrogen** gas in a **1.753** L container at **265.8** K should exert a pressure of **11.38** atm. By what percent does the pressure calculated using the van der Waals' equation differ from the ideal pressure? For **N _{2}** gas, a =

**1.390**L

^{2}atm/mol

^{2}and b =

**3.910E-2**L/mol.

*Hint:* % difference = 100 x (P _{ideal} - P_{van der Waals}) / P _{ideal}

10. What volume of **hydrogen sulfide** is required to produce **29.6** liters of **sulfur dioxide** according to the following reaction? (All gases are at the same temperature and pressure.)**hydrogen sulfide** (**g**) ** + ****oxygen****(****g****)--->****water** (**l**) ** + ****sulfur dioxide****(****g****)**

**_____ L Hydrogen Sulfide**

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