Question

For the following reaction, what mass of SIC is made from120.2g of SIO2 and 120g of C?

SiO2(s) + 3C(s) ---SiC(s) +2CO(g)

Answer 1

This post is a limiting reagent problem. I know because values for BOTH reactants are given. Here is a example of a simple stoichiometry problem. Just follow the instructions for EACH reactant. The correct one will be the one providing the smaller value for the product and that reagent is the limiting reagent.
http://www.jiskha.com/science/chemistry/stoichiometry.html

Answer 2

If 100 grams of SiO2 and 120 grams of C react, Calculate the moles of both of them