Question

How does the law of conservation of mass apply to this reaction: C2H4 + 3O2 --> 2H2O + 2CO2?

A.Only the oxygen needs to be balanced
B. The equation needs to be balanced. There are fewer oxygen atoms in the equation than hydrogen and carbon
C.The law of conservation of mass has already been applied
D. Each element needs to be balanced

Answer 1

C. The law of conservation of mass has already been applied. The number of moles of reactants is already equal to the number of moles of the products.