The following formula is used to calculate percentage mass: Finally, divide the gram formula mass for iron by the total gram formula mass of iron (III) oxide and convert to a percentage.

It can be calculated using the formula: Percentage Composition=(Mass of the element in 1 mole of the compound/Molar mass of the compound)×100% The mass of one mole of a substance. The percentage ...

Moles can be compared but masses cannot so the following equation is used to help convert between moles and mass: Calculate the mass of sodium chloride produced when 11.5 g of sodium is reacted ...