Question

Given the balanced reaction: Zn + 2HCl H2 + ZnCl2 How many grams of zinc are needed to produce 5 grams of H2?

Answer 1

`161.9gZn`

Step-by-step explanation:

Hello there!

In this case, according the given balanced chemical reaction:

`Zn + 2HCl\rightarrow H_2 + ZnCl_2`

It is possible to evidence the 1:1 mole ratio of hydrogen (molar mass = 2.02 g/mol) to zinc (atomic mass = 65.41 g/mol) which is used to calculate the grams of the latter needed for the production of 5 grams of the former via stoichiometry:

`5gH_2*(1molH_2)/(2.02gH_2)*(1molZn)/(1molH_2) *(65.41gZn)/(1molZn)\\\\=161.9gZn`

Best regards!