Question

In the decomposition of potassium chlorate to produce potassium chloride and oxygen gas, if the atmospheric pressure is 82.5 kPa and the vapor pressure of water at 25.0 ºC is 3.2 kPa, what is the partial pressure of the oxygen gas?

a) 79.3 kPa
b) 82.5 kPa
c) 3.2 kPa
d) 75.1 kPa

Answer 1

The partial pressure of oxygen gas is 79.3 kPa.

Step-by-step explanation:

To determine the partial pressure of oxygen gas in the decomposition of potassium chlorate, you need to subtract the vapor pressure of water from the atmospheric pressure. The atmospheric pressure is 82.5 kPa and the vapor pressure of water at 25.0 ºC is 3.2 kPa. So, the partial pressure of oxygen gas is 82.5 kPa - 3.2 kPa = 79.3 kPa.