Given a fixed amount of an ideal gas held at constant pressure, calculate the vo

Question

Given a fixed amount of an ideal gas held at constant pressure, calculate the volume it would occupy if a 2.00 L sample were cooled from 60.0°C to 30.0°C.

1.00 L

4.00 L

0.20 L

1.82 L

0.455 L

2.

If the average rate of appearance of NH3 in the following reaction is 1.40 M/s, what is the average rate of disappearance of H2 during the same time period?

N2(g) + 3H2(g)   2NH3(g)

5.40 M/s

2.80 M/s

1.20 M/s

0.700 M/s

2.10 M/s

1.00 L

4.00 L

0.20 L

1.82 L

0.455 L

2.

If the average rate of appearance of NH3 in the following reaction is 1.40 M/s, what is the average rate of disappearance of H2 during the same time period?

N2(g) + 3H2(g)   2NH3(g)

5.40 M/s

2.80 M/s

1.20 M/s

0.700 M/s

2.10 M/s

Explanation / Answer

1. Using Charles Law

V1/T1 = constant = V2/T2

2L / 60oC = V2/30 oC

V2 = 2L/60oC x 30 oC = 1L

Volume occupied = 1.00 L

2. average rate of appearance of NH3 = d[NH3]/dt = 1.40M/s

average rate of disappearance of H2 = d[H2]/dt

d[H2]/dt = d[NH3]/dt x 3mol H2/2 mol NH3 = 1.4 x 3/2 M/s = 2.1M/s

average rate of disappearance of H2 = 2.1M/s

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