Question

What mass of sulfur combines with 8 grams copper to form copper (I) sulfide Cu2S?

Answer 1

1)Construct a balanced chemical equation
2Cu+S-->Cu2S
2)Number of moles=Mass(g)/Molar Mass(g/mol)
3) according to the balanced chemical equation, prepare a mole ratio of the reactant and products.
Use again Number of moles=Mass(g)/Molar Mass(g/mol) but rearrange it Number of moles*Molar Mass(g/mol)=Mass(g)
Look for coppers and sulphur atomic weight in your periodic table.

Answer 2

Thanks!

Answer 3

your most welcome :)