Question

Which of the following is the correct formula to calculate percent by mass? [Mass of solution (g) + mass of solute (g)] × 100 [Mass of solute (g) − mass of solution (g)] × 100 [Mass of solute (g) ÷ mass of solution (g)] × 100 [Mass of solution (g) ÷ mass of solute (g)] × 100

Answer 1

Considering the definition of percent by mass, the correct answer is the third option: the correct formula to calculate percent by mass is [Mass of solute (g) ÷ mass of solution (g)] × 100

Definition of percent by mass

The percent by mass is a measure of the amount of mass that an element occupies in a compound and it is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.

To calculate the percentage of composition, it is necessary to know the mass of the element in a known mass of the compound.

So, the percent by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage:

percent by mass= [Mass of solute (g) ÷ mass of solution (g)] × 100

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