** *im so stuck on this test i dont understand any of it* which statement is a correct statement for the law of conservation of mass? a. the total mass decreases during a chemical reaction b. the total mass increases in a chemical reaction c. the total mass remains the same during a chemical reaction d. the total mass is unpredictable in a chemical reaction which element(s) are not balanced in this equation? fe2o3+3 co -> fe+3 co2 a. only the o is unbalanced b. c and o are bothe unbalanced c. fe and o are both unbalanced d. only the fe is unbalanced