Question

How many moles of a gas at 100°C does it take to fill a 0.50 L flask to a pressure of 1.25 atm?

0.020 moles
0.053 moles
0.086 moles
0.204 moles

Answer 1

The answer to your question is: 0.02 moles

Step-by-step explanation:

Data

n = ?

T = 100°C = 373 °K

V = 0.5 l

P = 1.25 atm

R = 0.082 atm L/mol °K

Formula

PV = nRT

Substitution

n = PV / RT

n = (1.25)(0.5) / (0.082)(373)

n = 0.625 / 30.59

n = 0.02 moles