Review on gases - COHS IB and CP Chemistry

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Review on gases

1.

An air balloon has a volume of 3.5L when in its at an altitude where the pressure is 743mmHg. What volume will the balloon have when it drops to sea level. Assume no change in temperature.

2.

NO

2

gas is produced in the internal combustion engine of cars. What volume of N0

2

gas at a temperature of 670K, and

3 atm is produced per gallon of gasoline if the combustion of one gallon of gasoline produces 0.050 moles of NO

2

?

3.

Given the reaction bleach and nitric acid: a.

2HOCl + 2HNO

3

Cl

2

+ 2H

2

O + 2NO

3

b.

What volume of Cl

2

gas would be produced at r.t.p. if

100.0ml of 0.10HOCl is reacted with an excess of

HNO

3

? (use molarity for the HOCl) c.

If 2.5L of Cl

2

was produced at s.t.p., what volume,in L, of a 3.0MHNO

3

must have been reacted? (Use molarity for the HNO

3

) d.

What volume of Cl

2

at 2.0atm, and 20C. will be produced by the reaction of 100.g HOCl?

4.

What would be the mass of 2.0L of CH

4

gas at s.t.p.?

5.

How many molecules would be in 2.0L of CH

4 gas at s.t.p.?

Answers:

1.

3.4L

2.

.92L

3.

b) 1.2L c) 0.074L d) 8.7L

4.

1.43g

5.

5.4x10

23

molecules

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