Mac mixed 24 g of substance a and 12 g of substance b to form 10 g of substance c and a certain amount of substance d. which statement is correct? the mass of substance d was 2 g greater than the mass of substance a. the mass of substance d was 10 g greater than the mass of substance b. the mass of substance a was equal to the total mass of substance c and substance d. the mass of substance a was equal to the total mass of substance b and substance d.