dilute solution of sulfuric acid is added to 15g of copper and iron mixture. a) write the balanced equation for the occuring reaction. b) the volume of H2 evolved at standard conditions is 4.48L, what is the mass of each of the metals constituting the mixture? Vm=24mol.L-1

Answer 1

NOTE: I am using 22.4 L/mol for Vm instead of 24 L/mol
Cu + H2SO4 ==> no reaction.
Fe + H2SO4 ==> FeSO4 + H2
mols H2 evolved = 4.48/22.4 L = 0.2 mol
0.2 mol H2 = 0.2 mol Fe to start.
grams Fe = 0.2 mols x atomic mass Fe = ?
another note: Some industries use 24 L/mol for Vm. But I'm using STP as 273.15 K and 1 atm.
Then mass Fe + mass Cu = 15 g. You know mass Fe. Solve for mass Cu.