Question

A sample of gas occupies 19 L under a pressure of 1.3 atm. What would the resulting valume be if the pressure were increased to 3.9 atm if the temperature did not change?

Your Answer:Question 1 options:

Question 2

A sample of CO2 occupies 200 ml at 373 K. At what temperature (in K) would it occupy 300 ml if the pressure did not change?

Your Answer:Question 2 options:

Question 3

A sample of Helium occupies 200 L at 30ºC under a pressure of 852 torr. What is the volume it occupies at standard temprature and pressure (STP)?

Your Answer:Question 3 options:

Question 4

Nitric acid, a very important industrial chemical, is made by dissolving the gas nitrogen dioxide (NO2) in water. Calculate the moles of gas produced in 2 L volume container, 744 torr and 50 ºC if the gas behaves as ideal:

Your Answer:Question 4 options:

An unknown amouont of sodium bicarbonate reacts with excess hydrochloric acid in a gas producing reaction. The reaction vessel has the same set-up as that in lab. Paying attention to the partial pressures of water in your lab book, if 155-mL of salt water was collected in the beaker at 23C and 765mmHg, how many grams of sodium bicarbonate did one begin with?Question 5

Answer 1

1)
use:
Pi*Vi = Pf*Vf
1.3 atm * 19 L = 3.9 atm * Vf
Vf =6.3 L

Answer: 6.3 L

2)
use:
Vi/Ti = Vf/Tf
200 mL/ 373 K = 300 mL/Tf
Tf = 559.5 K

Answer: 559.5 K

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