Calculate atom economy for a reaction.

In the subtopic Balanced equations and reacting quantities, this AQA A-Level Chemistry 7405 learning objective focuses on calculate atom economy for a reaction. It belongs to Amount of substance, so revision should stay anchored to this exact subtopic rather than drifting into a generic GCSE-level chemistry summary. Approved keywords to use include atom economy. Atom economy. means a measure of the efficiency of a reaction, calculated as the ratio of the relative formula mass of the desired product to the sum of the relative formula masses of all products, expressed as a percentage Avoid the mistake of students often confuse atom economy with percentage yield, calculating it incorrectly by using actual yield instead of the relative formula mass of the desired product; instead, to calculate atom economy, use the formula: atom economy = (Mr of desired product / sum of Mr of all products) x 100. For example, if the desired product has a relative formula mass (Mr) of 18 g/mol and the total products have a sum of 36 g/mol, substitute: atom economy = (18 / 36) x 100 = 50%. Therefore, the atom economy is 50% For exam answers, to calculate atom economy, use the formula: atom economy = (Mr of desired product / sum of Mr of all products) x 100. Identify the desired product and all products involved in the reaction