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Gas Laws and Solutions Chemistry Practice Questions

## Question 1

1.  A sample of gas is in a cylinder of fixed volume.  At 20.0 °C its internal pressure is 3.42 atm.  What will be its pressure at 120.0°C?

2.  A sample of gas has a volume of 200. ml at 20.0 ° C. What will be its volume at 40.0 °C? pressure remains constant

3.  A sample of gas has a volume of 1380 mL at 2atm.  What will be its volume in Liters be at 5.0 atm? pressure remains constant.

4.  What is the molar mass of a gas if 16.0 L of the gas has a mass of 19.0 g at 9 65 torr and 20.0 °C?

A.  0.0352 g

B.  28.4 g

C.  26.8 g

D.  1.94 g

5. Which is true of a gas concentration in solution?

A. temperature will increase the concentration.

B. pressure will increase the concentration.

C. neither

D. both

6. Explain how to make a solution super-saturated.

7. Describe what makes up a solution.

8. What is the mass percent of a solution that contains 75 grams of NaOH in 0.250 Kg of water?

9. What is the molarity of a solution that contains 90 grams of Ca(OH)2 in 325 ml of water?

10. 25ml of Ethanol was added to a flash and the flash was then filled to 125ml with water. What is the volume % of the solution?

11. How many grams of NaCl in 80 ml of a 7M NaCl solution?

12.  45 ml of a 12M solution of NaOH is diluted with 130 ml of water. What is the molarity of the new solution?

13. How would you make a solution that you use 100 ml of a 6M NaCl and you want to dilute it to 200 ml of the 3M NaCl solution?

14. A 60% v/v solution of ethanol will contain how many ml of ethanol?

15. To make 500ml of a 6M NaOH solution, how many ml of a 10.5M NaOH is needed?

16. As you increase the temperature of a gas at constant pressure and amount, what will happen to the volume?

A. decrease

B. increase

C remain the same

D cannot determine

17. What is the name of the instrument used to measure pressure? _________________

18. 1835torr represent how many psi?

19. What is kept constant with Boyles Law?

20. What is the mass/volume% of 8 grams of NaCl in 70L of water?

21. A gas has a molar mass of 20g/moles at a pressure of 800mmHg, volume 725ml and temperature 190C. What is the mass of the gas

22. As you increase the pressure of a gas what happen to the volume at constant temperature and amount?

23. What the difference between a compound in its liquid state vs gaseous state?

24. The density of a gaseous compound is greater than its liquid state. True or False.

25. Which statement/s below is/are true?

A.  I will stay focus on getting my degree: coronavirus will not stop me!

B.  I will follow CDC guidelines.

C.  I will keep my family safe in this unprecedented time.

D. All of the above

E. None of the above.