High School

A quantity of gas at a temperature of 18°C has a volume of 124.5 mL at a pressure of 97.8 kPa. How many moles of gas are there?

Answer :

Explanation:

Use the Ideal Gas Law

PV = n R T P = 97.8 kPa V=.124 liters n = ? #moles

T = temp in Kelvin = 18 + 273.15 = 291.15 K

R = gas constant =8.314462618 L kPa / (K mol)

Substitute in the given numbers and solve for 'n'

97.8 * .124 = n * 8.314462618 * 291.15

n = .005 moles

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