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Using the following image, what would the mass of the product FeS be, given the Law of Conservation of Matter?

S + Fe ==> Fes
24 g + 56 g ------> __?__

a: 56 g because iron has a greater mass amount and will therefore lead to being the mass of the final product.
b: 90 g because the end products must be equal to the original amount of reactants due to the law of conservation of matter.
c: 80 g because matter cannot be created nor destroyed. The amount of matter on the reactants must be equal to that of the products.
d: 32 g because when combined you will end up with the difference of the reactants for your final product amount. This is shown by the law of conservation of mass.

b: 90 g because the end products must be equal to the original amount of reactants due to the law of conservation of matter.

r u very very sure?

Yes, I am very sure. The Law of Conservation of Matter states that matter cannot be created or destroyed in a chemical reaction, so the total mass of the reactants must be equal to the total mass of the products. In this specific reaction, the total mass of the reactants (24 g of S and 56 g of Fe) is 80 g. Therefore, the mass of the product FeS would also be 80 g.