Question

`Sn(s)+ 2 HF (g) -> SnF_2(s) + H_2(g)` How many grams of hydrogen gas will be produced if 2.5 mole of tin react?

Answer 1

You will get 5.0 g of hydrogen.

Explanation:

As with any stoichiometry problem, we start with the balanced equation.

`"Sn"color(white)(l) + "2HF" → "SnF"_2 + "H"_2`

`"Moles of H"_2 = 2.5 color(red)(cancel(color(black)("mol Sn"))) × ("1 mol H"_2)/(1 color(red)(cancel(color(black)("mol Sn")))) = "2.5 mol H"_2`

`"Mass of H"_2 = 2.5 color(red)(cancel(color(black)("mol H"_2))) × ("2.016 g H"_2)/(1 color(red)(cancel(color(black)("mol H"_2)))) = "5.0 g H"_2`