Chemistry Formulas

Mass Percent Formula

The way of expressing a concentration is mass percent. Moreover, it describes the component in a particular mixture. The solution composition can be understood in a mass percentage. It shows the mass of solute present in a given mass of solution. The quantity of solute is expressed in mass or by moles. In this article, we will learn the mass percent formula with various solved numerical.

Mass Percent Formula

The mass percent may be a way of expressing a degree. Moreover, it describes the component during a particular mixture. The solution composition is often described in mass percentage. It shows the mass of solute present during a given mass of solution. The number of solutes is expressed in mass or by moles. During this article, we’ll learn the mass percent formula with various solved numerical.

Mass percent = (component’s mass ÷ total mass) x 100% or

Percentage of mass = (solute’s mass ÷ mass of solution) x 100%

The Mass percent formula is expressed as solving for the molar mass also for the mass of every element in 1 mole of the compound. You’ll determine the mass percentage of every element with these masses. For a solution, the mass percent is expressed because the grams of solute divided by the grams of solution, then multiplied by 100 to urge a percentage.

Usually, mass is expressed in grams, but any unit of measure is suitable as long as you utilize an equivalent unit for both the component or solute mass and therefore the total or solution mass. Mass percent is additionally referred to as percent by weight or w/w%.

Mass Percent Formula

Steps for Finding the Mass Percentage

  • Step 1: Define the equation for mass percent of a compound. The essential formula for mass percent of a compound is mass percent = (mass of chemical÷total mass of compound) x 100. You want to multiply by 100 at the top to specify the value as a percentage.
  • Step 2: Calculate the entire mass of the compound. once you know the masses of all the elements or compounds being added together, you merely got to add them together to calculate the entire mass of the ultimate compound or solution. And this may be the denominator within the mass percent calculation.
  • Step 3: Identify the mass of the chemical-in-question. When asked to seek out the “mass percent”, you’re being asked to seek out the mass of a specific chemical (the chemical-in-question) as a percentage of the entire mass of all elements. Then write down the mass of the chemical-in-question. This mass is the numerator within the mass percent calculation.
  • Step 4: The variables into the mass percent equation. So once you’ve got determined the values for every variable, plug them into the equation.
  • Step 5: Calculate the mass percent. The equation is filled in, so now simply solve to calculate the mass percent. Divide the mass of the chemical by the entire mass of the compound and multiply by 100. This may offer you the mass percent of the chemical.

Solved Examples for Mass Percent Formula

Q] Calculate the grams of NaOCl (6.15% by mass) in 285 grams of a billboard bleach solution.

Solution – During this problem the equation should be rearranged to unravel for the grams of solute.

We have,

Percentage of mass = ( Solute’s mass / solution’ mass) x 100%

Gram of solute = (mass percent X gram of solution)/100

Gram of solute = (6.15 X 285) /100 = 17.52 grams.

Therefore, the gram of solute is 17.52 grams.

Q] What’s the percent mass of 5g of caustic soda dissolved in 100g of water?

Solution: Steps are as follows

  1. The entire mass of the compound is that the amount of caustic soda plus the quantity of water: 100g + 5g for a complete mass of 105g.
  2. Now the mass of the chemical-in-question is 5g of caustic soda.
  3. Mass percent = (mass of chemical/total mass of compound) x 100 = (5 g/105 g) x 100.
  4.  (5/105) x 100 = 0.04761 x 100 = 4.761%.

Therefore, the mass percent of 5g of caustic soda dissolved in 100g of water is 4.761%.

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