Question

A sample of krypton gas collected at a pressure of 1.30 atm and a temperature of 17.0 °C is found to occupy a volume of 24.7 liters. How many moles of Kr gas are in the sample?
mol

Answer 1

To find the number of moles of krypton gas in the sample, we can use the ideal gas law equation:

PV = nRT

Where:
P = pressure = 1.30 atm
V = volume = 24.7 L
n = number of moles (what we want to solve for)
R = ideal gas constant = 0.0821 L.atm/mol.K
T = temperature in Kelvin = 17.0°C + 273.15 = 290.15 K

Plugging in the values:

(1.30 atm)(24.7 L) = n(0.0821 L.atm/mol.K)(290.15 K)

31.91 = 23.84n

Divide by 23.84:

n = 1.34 moles

Therefore, there are 1.34 moles of krypton gas in the sample.