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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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