What mass of zinc is required to completely react with 250 mL of H2SO4 with a concentration of 0.150 M?

Question

Zn_(s) + H₂SO_4(aq) ZnSO_4(aq) + H_2(g)

What mass of zinc is required to completely react with 250 mL of H₂SO₄ with a concentration of 0.150 M?

Answer 1

Zn(s) + H2SO4(aq) ==> ZnSO4(aq) + H2(g) ... balanced equation

Find the moles of H2SO4 present: 250 ml x 1 L/1000 ml x 0.150 mol/L = 0.0375 moles H2SO4

Next, find moles Zn needed: 0.0375 mol H2SO4 x 1 mol Zn / mol H2SO4 = 0.0375 mol Zn

Finally, convert moles Zn to g of Zn: 0.0375 mol Zn x 65.4 g Zn/mol Zn = 2.45 g Zn