Question

please do all. thanks.

1.  

a. A weather balloon is filled to the volume of 105 L on a day when the temperature is 25°C. If no gases escaped, what would be the volume of the weather balloon after it rises to an altitude where the temperature is -9°C?

Volume = L?

b A 203-mL sample of a gas exerts a pressure of 2.55 atm at 19.5°C. What volume would it occupy at 1.85 atm and 190.°C?

Volume = ?mL

2.

a. Find the molecular weight (mass) of Freon-12 (a chlorofluorocarbon) if 8.63 L of vapor at 200.°C and 820. torr has a mass of 29.0 g.

Molecular weight = ?g/mol

4.

a. A sample of nitrogen gas at a pressure of 1.09 atm and a temperature of 23.0 °C, occupies a volume of 537 mL. If the gas is compressed at constant temperature until its pressure is 1.57 atm, the volume of the gas sample will be ? mL.

b. A sample of xenon gas at a pressure of 0.907 atm and a temperature of 26.7 °C, occupies a volume of 15.4 liters. If the gas is allowed to expand at constant temperature to a volume of 24.6 liters, the pressure of the gas sample will be ? atm.

5.

a. A sample of nitrogen gas at a pressure of 0.713 atm and a temperature of 227 °C, occupies a volume of 634 mL. If the gas is cooled at constant pressure until its volume is 544 mL, the temperature of the gas sample will be ? °C.

b.

A sample of xenon gas at a pressure of 736 mm Hg and a temperature of 58 °C, occupies a volume of 11.7 liters. If the gas is cooled at constant pressure to a temperature of 24 °C, the volume of the gas sample will be ? L.

6.

a.  1.44 mol sample of nitrogen gas at a temperature of 25.0 °C is found to occupy a volume of 22.7 liters. The pressure of this gas sample is ? mm Hg.

b. A sample of xenon gas collected at a pressure of 657 mm Hg and a temperature of 291 K has a mass of 154 grams. The volume of the sample is  L.

7.

a. A sample of hydrogen gas has a density of ? g/L at a pressure of 1.28 atm and a temperature of 38 °C. Assume ideal behavior.

b.

A sample of oxygen gas has a density of  g/L at a pressure of 1.08 atm and a temperature of 46 °C. Assume ideal behavior.

8.

a. Zinc metal reacts with excess hydrochloric acid to produce hydrogen gas according to the following equation:

Zn(s) + 2HCl(aq)ZnCl₂(aq) + H₂(g)

The product gas, H₂, is collected over water at a temperature of 20 °C and a pressure of 743 mm Hg. If the wet H₂ gas formed occupies a volume of 9.41 L, the number of grams of H₂ formed is ? g. The vapor pressure of water is 17.5 mm Hg at 20 °C.

b. Zinc metal reacts with excess hydrochloric acid to produce hydrogen gas according to the following equation:

Zn(s) + 2HCl(aq)ZnCl₂(aq) + H₂(g)

The product gas, H₂, is collected over water at a temperature of 25 °C and a pressure of 746 mm Hg. If the wet H₂ gas formed occupies a volume of 7.26 L, the number of moles of Zn reacted was ?mol. The vapor pressure of water is 23.8 mm Hg at 25 °C.

Answer 1