Question

Will give a metal! :)
Balance:
____ NaS + ____ ZnNO3 ---> ____ NaNO3 +____ZnS

____ Mg + ____ AgNO3 → ____ Mg(NO3)2 + ____ Ag

____ CH4 + ____ O2 → ____ H20 + ____ CO2

Answer 1

You must balance ions or elements in this type of exercise.
Are you sure there is no typos in the first one?

Answer 2

I think there is...but I answered it already...thanks!