How To Calculate Mass Percent?

published on: 13 December 2021 last updated on: 12 June 2023
Mass Percent

Do you know how to calculate mass percent? Well, in terms of mass percent, the percent composition must be understood. It displays the amount of solute in a given volume of solution.

The amount of solute is measured in various forms from mole percent to mass percent. So, it is an important analytical and forensic approach is determining the composition of a solution. 

When water is used to make a solution, it is referred to as aqueous. The solvent is the major component of a solution, whereas the solute is the small component that is dissolved.

To produce a solution, the solute is dissolved in the solvent. So, if you want to figure out how to calculate mass percent, make sure you go through this article step by step.

Mass Percent Formula

It’s possible that the mass percent is a technique of representing a degree. It also describes the component during a certain combination. The mass percentage of a solution is frequently used to characterize its composition. 

It displays how much solute is present in a given volume of solution. The number of solutes can be measured in either mass or moles. We’ll study how to calculate mass percent here with a set of mathematical formulas.

Mass percent = component’s mass × total mass × 100 

Mass percent = solute’s mass × mass of solution × 100

Solving for the molar mass as well as the mass of each element in 1 mole of the compound is how the Mass percent formula is represented. With these masses, you’ll calculate the mass percentage of each element. 

Now, divide the grams of solute by the grams of solution and multiply it by 100 to get a percentage. 

Mass is commonly represented in grams, although any unit of measure will suffice as long as the component or solute mass and, therefore, the total or solution mass are given in comparable units. 

How To Calculate Mass Percent?- The Steps

How to calculate mass percent? The mass percent calculation method of expressing a concentration is shown here step-by-step. So, follow these steps and find out the calculation process of mass percentage.

Step 1: Define the mass percent equation for a chemical. The percent composition formula for calculating a compound’s mass percent is mass percent = (mass of chemical + total mass of compound) × 100. To express the value as a percentage, multiply the resultant factor by 100. 

Step 2: Determine the compound’s total mass. Once you have the masses of all the elements or compounds being combined, all you have to do is add them up to get the total mass of the final compound or solution. Moreover, it’s also possible that this is the denominator in the mass percent computation.

Step 3: Find out how much the substance in the issue weighs. When you want to find out how to calculate mass percent, you’re looking for the mass of a single chemical expressed as a percentage of the total mass of all elements. The mass of the chemical in question should then be written down. Within the mass percent composition, this mass is the numerator.

Step 4: Incorporate the variables into the mass percentage equation. So, once you’ve figured out what each variable’s value is, entering it in the equation form, and calculating mass percent should not be a big deal.

Step 5: Subtract the mass percent from the total. Now that the equation has been filled in, all you have to do is solve it to get the mass percent. Divide the chemical’s mass by the compound’s total mass and multiply by 100. Thus, you’ll find out how to calculate mass percent in seconds. 

How To Calculate Mass Percent?-Examples

One technique to indicate the concentration of a dissolved component in a solution is to use mass percentage. The mass percentage of a chemical in a solution is the ratio of that compound’s mass to the overall mass of the solution given in percent. 

So, how to calculate mass percent? Let’s look at this example, and use it as a mass percentage calculator

You are asked to calculate the mass percent concentration of a solution made from 10 g of sodium chloride (NaCl) and 6 g of sodium bicarbonate (NaHCO3) dissolved in 120 g of water. 

To compute the total mass of the solution, add the mass of all compounds in the solution, including the solvent. The mass of the solution in this case is 10 g + 6 g + 120 g = 136 g, where mass (NaCl) + mass (NaHCO3) + mass (water) = 10 g + 6 g + 120 g = 136 g.

But, how to calculate mass percent? Just, divide the mass of the first dissolved component by the mass of the solution, then multiply the result by 100.

The first dissolved chemical in our case is NaCl, with a mass percent of (10 g / 136 g) x 100 percent = 7.35%.

To compute the mass percentage, divide the mass of the second dissolved component by the mass of the solution, then multiply by 100.

The second dissolved molecule, in this case, is NaHCO3, which has a mass proportion of (6 g / 136 g) times 100 percent = 4.41%.


1: How To Calculate Mass Percent Of Acetic Acid In Vinegar?

Ans: The mass of acetic acid in vinegar may be calculated by multiplying the moles by the molar mass of the acetic acid. The volume of the solution in mL will then be divided by this. Now, multiply the acetic acid moles by the acetic acid’s molecular weight, and the grams of acetic acid in the vinegar sample will be derived.

2: How To Calculate Atomic Mass With Percent Abundance?

Ans: Divide each percent abundance by 100 to get a decimal value. Multiply this value by the isotope’s atomic mass. To get the average atomic mass, add the masses of each isotope together.

3: How To Calculate Mass Percent Of Water In A Hydrate?

Ans: Multiply the weight of the water lost by the weight of the hydrate. By dividing the mass of water in one mole of the hydrate by the molar mass of the hydrate and multiplying by 100, the actual percent hydration may be derived.

Final Thoughts

We have already told you how to find mass percent. The percent composition formula is also expressed here. But, if you want to find out which solvent will make a perfect compound there are acetone, ether, or alcohol, which can be used as a solvent in chemical labs.

The solute can be either a liquid or a solid, however, this experiment only looks at solids. In everyday life, as well as practically all biological systems, water is the most frequent solvent. So, if you want to know more about how to calculate mass percent, let us know in the comment section below.

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