What is the volume of 1.0g of hydrogen gas at 0 degrees celsisus and 1 atmosphere? The density of hydrogen under these conditions is 0.090g per L.

STP = 0 C (273K) and 1 atm. Those conditions are stipulated in the problem. therefore, simply use the density equation.

mass = volume x density.
Substitute and solve for volume.
Round to the correct number of significant figures.