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What does percent by mass mean?

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Anonymous Posted

What does percent by mass mean?

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2 Answers

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Melissa Robbins

Percent by mass means (mass of substance/total mass) x 100%.  For instance if you have 100g of solution which contains 5.4 grams of HCl you can say it contains 5.4/100 x 100 = 5.4% HCl.    

It is one way of way of representing concentration. 

It means the mass of the component divided by the total mass of the substance.x 100%.  

You can also do it for individual components in a compound.    For instance if you have a compound of NaCl  you could calculate the mass percentage of each component in NaCl  so you can do 

(mass Na / mass NaCl) x 100 = (23.44/58.44)  x100 = 41%

(mass Cl / mass NaCl) x 100 = (35/58.44) x 100 = 59%

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hemant kumar

Percent by mass or mass % = (mass of the compound under consideration/mass of the compound/mixture as a whole)*100

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