Question

a certain amount of metal whose equivalent mass is 28 displaces 0.7 L of H2 at STP from an acid , hence the mass of the element is?

Answer 1

we know at STP 1mol= 22.4L so 0.7L=0.0312 mol let x be the mass of element. now
x/28=0.0312/2 therefore x=1.75 g