# 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**

## Tutor Answer

**Quality**

**Communication**

**On Time**

**Value**

Brown University

1271 Tutors

California Institute of Technology

2131 Tutors

Carnegie Mellon University

982 Tutors

Columbia University

1256 Tutors

Dartmouth University

2113 Tutors

Emory University

2279 Tutors

Harvard University

599 Tutors

Massachusetts Institute of Technology

2319 Tutors

New York University

1645 Tutors

Notre Dam University

1911 Tutors

Oklahoma University

2122 Tutors

Pennsylvania State University

932 Tutors

Princeton University

1211 Tutors

Stanford University

983 Tutors

University of California

1282 Tutors

Oxford University

123 Tutors

Yale University

2325 Tutors