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Tuesday, 11 September 2018

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Chemistry: Molar Mass, Examples and Solutions



Molar mass

The formula mass or molar mass of a compound is the mass of the correctly written formula or one molecule of the compound, obtained by adding together the appropriate relative atomic masses of the atoms of the elements present in the molecule.

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Let's take some examples,

Example 1
Calculate the molar mass of Calcium trioxonitrate (v) [Ca(NO3)2] in grams.

Solution
[Ca=40, N=14, O=16]
Molar mass = [40 + 2(14 + 3(16)) ]
Molar mass = [40 + 2(14 + 48) ]
Molar mass = [40 + 2(62)]
Molar mass = 164

Example 2
Calculate the molar mass of Magnesium tetraoxosulphate (vi) heptahydrate crystals [MgSO4 . 7H2O].

Solution
[Mg =24, S=32, O=16 H=1]
Molar mass = [24 +32 + 4(16) +7(2(1) + 16)]
Molar mass = [24 +32 + 64 +7(18)]
Molar mass = [24 +32 + 64 + 126]
Molar mass = 246




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