if 3.5g of Zn and 3.5g S are mixed together and heated, what mass of ZnS will be produced?

Question

what is the limiting reactant?

Answer 1

moles of zinc--> 3.5g / 65.39 g/mol =0.054 mol

moles of S--> 3.5 / 32.07 = 0.11 mol

We can see that since the ratio of both Zn and S to ZnS is one to one, zinc is the limiting reagent since there are fewer moles of it.

0.054mol Zn * 1/1 = 0.054 mol ZnS

m= 0.054 mol (97.45 g/mol ZnS) = 5.3 g

Answer 2

Go to your periodic table, and look up which one is heavier. (It's Zinc.) The same weights of Zinc and Sulphur contain fewer atoms of Zinc than Sulphur.

So all the Zinc atoms get mates, but a bunch of Sulphur atoms are left over and go away lonely and crying.

Answer 3

try it and find out