Chlorophyll, the green colouring matter of plants responsible for photosynthesis, contains 2·68% of magnesium by mass. Calculate the number of magnesium atoms in 2·000g of chlorophyll.

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Calculate the mass of 1 a.m.u in grams.


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The cost of table salt (NaCl) is Rs 8 per kg. Calculate its cost per mole.


Molar mass of table salt (NaCl)
                            = 23 + 35.5 = 58.5 g mol-1 

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0.01 mole of a compound weighs 1 g. Calculate the molecular mass of the compound.


0.01 mole of a compound high = 1 g
1 mole of a compound would weigh
                                  

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