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Calculation of molar mass

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Calculation of molar mass

    • Posted by Utsav Mishra 3 years, 11 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Sandeep Kumar 3 years, 11 months ago

    W/m

    1Thank You

    Yogita Ingle 3 years, 11 months ago

    Step 1. Make use of the chemical formula to determine the number of atoms of each element in the compound.

    Step 2. Multiply the atomic weight of each element with its number of atoms present in the compound.

    Step 3. Add up all and assign unit as grams/mole.  

    Example. 1  What is the molar mass of sodium carbonate, Na2CO3 ?

    Solution Since sodium carbonate contains two atoms sodium, one atom of carbon and three atoms of oxygen. The molecular weight would be

    Na : 2 x 23.0 =  46

    C : 1 x 12.0 = 12

    O : 3 x 16 = 48

    When we add up the total values i.e, 46 + 12 + 48 = 106

    Therefore, the molar mass of Na2CO3 is 106 g/mole.

    1Thank You

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