Which of these is the correct sequence of steps to convert from the mass in grams of substance b to the mass in grams of substance a?
1) Multiply by the molar mass of substance b and divide by the molar mass of substance a
2) Multiply by the molar mass of substance a and divide by the molar mass of substance b
3) Divide by the molar mass of substance a and multiply by the molar mass of substance b
4) Divide by the molar mass of substance b and multiply by the molar mass of substance a