What pressure will be exerted by 10 moles of hydrogen gas in a 7.5 L cylinder at 20°C? (Given: R = 8.314 L∙kPa/K∙mol)

Answer 1

Use the ideal gas law:
P V = n R T,
which tells you that
P = n R T/V

n = 10.0 moles
T = 293 K
V = 7.5 L
Solve for P in Pascals