Zn + 2HCI - -> ZnCl2 + H2

How many moles of hydrogen can you make with 7.9 g Zn?

mol

7.90 mol

65.38 mol

0.24

Moles = mass / relative formula mass (Ar)

moles of zinc = 7.9/30 = 0.263

so we have 0.263 moles of zinc, and you need twice the amount of chlorine so therefore 0.526moles of chlorine = 0.526x 17=8.942g of chlorine

i cba to work the rest out but the most reasonable answer is 0.24 mol however if you need to use working outs, use the formula i provided earlier