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?

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 (in atm)
V = volume (in liters)
n = number of moles
R = ideal gas constant (0.0821 L.atm/mol.K)
T = temperature (in Kelvin)

First, we need to convert the temperature from Celsius to Kelvin:

T = 17.0 + 273.15
T = 290.15 K

Now, we can plug in the values into the ideal gas law equation:

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

31.91 = 23.823n
n = 31.91 / 23.823
n ≈ 1.34 moles

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