What volume does 0.056 moles of h2 gas occupy @ stp?

At standard temperature and pressure conditions, 1 mol of any gas occupies a volume of 22.4 L. This is known as molar volume.
1 mol of H₂ gas occupies a volume of 22.4 L 
Molar volume - 22.4 L/mol
Therefore an amount of 0.056 mol of H₂ takes up - 22.4 L/mol x 0.056 mol 
Therefore volume used by 0.056 mol of H₂  - 1.25 L 

Ionic compounds dissociate into component ions dissolved into a solution creating substances called "electrolytes".hope my answer has you : )