What is the formula weight (molar mass) of a compound if 20 g of the compound in 500 mL of solution gives a 0.5 M solution?

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asked Jan 18, 2019 75.9k views

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Gaspar Teixeira · Answer 1 · 2019-01-22T15:33:44+0000

The molar mass of a compound is calculated as below

find the number of moles

moles= molarity x volume/1000

=500 ml x0.5 /1000 = 0.25 moles

molar mass is therefore= mass/number of moles

= 20/0.25 = 80 g/mol

What is the formula weight (molar mass) of a compound if 20 g of the compound in 500 mL of solution gives a 0.5 M solution?

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