If the particles, moles, or grams of a substance are known, the other two measurements can be calculated. We would interpret this in terms of moles as: "1 mole of CH4 reacts with 2 moles of O2 to form 1 mole of CO2 and 2 moles of H2 O".
Calculate the masses of substances shown in a balanced symbol equation.
In a balanced equation, the coefficients (the numbers in front of the formulae) show the amounts of the reactants and products. If there is no coefficient, the amount is one mole.
Calculate the masses of reactants and products from the balanced symbol equation and the mass of a given reactant or product.
Write down the balanced equation for the reaction.
Write the relative formula masses under the substances and add the units in the question.
Multiply the relativeformulamasses by the coefficients in the equation.
