Question

How many moles of argon atoms are present in 11.2 L of argon gas at STP? Round your molar mass to whole numbers andgive your answer in the correct number of sig figs and units

Answer 1

STP or Standard Pressure and Temperature is widely used when the subject is gases. The used standard temperature is 273 K or 0°C and the standard temperature used is 1 atm. At these conditions 1 mol will be equal to 22.4 L of volume, therefore if we have 11.2 L of Argon:

22.4 L = 1 mol

11.2 L = x moles of Argon

22.4x = 11.2 L

x = 0.500 moles of Ar will be present in 11.2 L of volume