what mass of zinc dissolved in dilute HCL will produce 0.15g of hydrogen ?



can you explain the steps to sloving this question please

1 answer

Write out the reaction:

ZN + 2 HCl --> ZNCl2 + H2

Covert g of H2 gas produced to moles:

0.15g of H2*(1 mole/2.016g)= moles of H2

moles of H2=moles of Zn

moles of Zn*(65.37g/mol)= g of Zn

Answer contains two significant figures

Conversely, this could have just been combined into one step;

0.15g of H2*(1 mole H2/2.016g)*(1 mol of Zn/1 mol of H2)*(65.37g Zn/mol)=g of Zn