Question

In the chemical equation `H_2 + Cl_2 ->2HCI` , what are the mole ratios?

Answer 1

Clearly the mole ratios of the reactants are `"1:1"`, and `"2 equiv"` of product result.

Explanation:

And this can be seen from the stoichiometric equation you have already written.....alternatively we could write....

`1/2H_2(g) + 1/2Cl_2(g) rarr HCl(g)`

....which preserves the same molar ratio, i.e. the SAME STOICHOMETRY. And thus we could say that 1 equiv of dihydrogen reacts with 1 equiv of dichlorine (and note that all of the reactive elemental gases are binuclear!) to gives the 2 equiv of hydrogen chloride gas.....

And likewise we could say that `1*g` of dihydrogen combines with `35*g` of dichlorine to give `36*g` of hydrogen chloride gas. Stoichiometry is maintained: `"garbage in equal garbage out"`.