Look at the following chemical equation.

4fes + 7o2 → 2fe2o3 + 4so2

what is true about this chemical equation?
a
it is balanced because the mass of the reactants is equal to the mass of the products.

b
it is unbalanced because the mass of the reactants is greater than the mass of the products.

c
it is balanced because the sum of the coefficients of the reactants is greater than the sum of the coefficients of the products.

d
it is unbalanced because the sum of the coefficients of the reactants is greater than the sum of the coefficients of the products.

sophia performs an experiment in which she adds 10.0 grams of zinc metal to 25.0 grams of bromine. she claims that mass will be conserved during the reaction. which of the following best supports her claim?

a
the mass of the final product will be equal to the mass of the zinc metal, 10.0 grams.

b
the mass of the final product will be equal to the difference between the two masses, 15.0 grams.

c
the mass of the final product will be equal to the mass of the bromine, 25.0 grams.

d
the mass of the final product will be equal to the total mass of both reactants, 35.0 grams.