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Grams to Moles Calculator
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The mole is measurable and observable in the laboratory. It is simple the atomic or formula weight expressed in grams rather than amu. In other words, for elements the atomic weight in the periodic table is not only the average number of amu per atom. Molar mass is used as a the conversion factor.

The atomic weight can be defined both in grams and moles, it can be used as a conversion factor to convert grams to moles and vice versa.

The dimensional analysis would appear as follows for the conversion from grams to moles.

$Grams\ to\ Moles = \frac{Mass}{Formula\ weight}$

 

Steps for Grams to Moles

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Step 1 :  

Read the problem and list out the values given.



Step 2 :  

Substitute the values in the corresponding formula to convert the value of grams to moles.


$Grams\ to\ Moles = \frac{Mass}{Fomula\ weight}$



Problems on Grams to Moles

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  1. How many moles does 17.3 grams of silver represent?


    Step 1 :  

    Grams of silver = 17.3


    From the periodic table the atomic weight
    (formula weight) of silver = 107.87g/mol



    Step 2 :  

    Substitute the values in the formula to convert the grams into moles.


    $Grams\ to\ Moles = \frac{Mass}{Fomula\ weight}$


    $Grams\ to\ Moles = \frac{17.3}{107.87}$


    Grams to Moles = 0.160 mol



    Answer  :  

    Thus 17.3 grams of silver represent 0.160 moles.



  2. Determine the number of moles in 88g of CO2.


    Step 1 :  

    The formula mass of CO2 = (1 $\times$ 12) + (2 $\times$ 16) = 44


    The given grams of CO2 = 88g



    Step 2 :  

    Substitute the values in the formula to convert the grams into moles.


    $Grams\ to\ Moles = \frac{Mass}{Fomula\ weight}$


    $Grams\ to\ Moles = \frac{88}{44}$


    Grams to Moles = 2 mol



    Answer  :  

    The number of moles in 88g of CO2 is 2 moles.



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