Name:, Lab Day/time Lab 8 Postlab Questions 1. A sample of pure nitrogen gas at

Question

Name:, Lab Day/time Lab 8 Postlab Questions 1. A sample of pure nitrogen gas at a temperature of 310 K occupies a volume of 950. mL and has a pressure of 825 mm Hg. What mass of gas is in the container? 2. A student reacted 0.150 g of NaNO2 in the same way that you did in your experiment. Assuming 25 °C, and 1.0 atm pressure, what volume of nitrogen gas would this correspond to? 3. In your experiment, when you trapped the nitrogen gas product, why was it important to ensure that the levels of water in the leveling bulb and the gas collection tube were the same? OVER

Explanation / Answer

1)

temperature = 310K

volume = 950 mL = 0.950 L

pressure = P = 825 mmHg

             = 1.086 atm

P V = n R T

1.086 x 0.950 = n x 0.0821 x 310

n = 0.0405

moles = 0.0405

mass = moles x molar mass of N2

mass = 0.0405 x 28

mass = 1.14 g

mass of N2 = 1.14 g

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