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Question

# Chlorophyll, the green colouring matter of plants contains 2.68% of magnesium by weight. Calculate the number of magnesium atoms in 2.00 g of chlorophyll?(Atomic mass of Mg=24)

A
1.3×1020
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B
1.3×1021
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C
1.3×1022
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D
1.2×1023
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Solution

## The correct option is B 1.3×1021Given amount of chlorophyll =2.0gmgiven amount of magnesium =2.68Mass of Mg in 2.0gm of chlorophyll =2.68×2100=0.054gm.6×1023 atoms of magnesium =24gm24gm of Mg contains 6.022×10230.054g of Mg contains =6.022×1023×240.054=1.3×1021

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