Chemical reaction is:
Zn+PbSO4→ZnSO4+Pb
From the balanced equation 2 moles of Zn make 2 moles of ZnSO4
You have 0.534 moles of zinc so you make 0.534 moles of ZnSO4.
Molar mass of ZnSO4 = 161 g/mol
mass = no of moles * molar mass
mass = 0.534 * 161
mass = 85.974 g
