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Chemistry Question on Some basic concepts of chemistry

Chlorophyll, the green colouring matter of plants responsible for photosynthesis contains 2.68 % of magnesium by mass. The number of magnesium atoms in 2.00 g of chlorophyll are

A

1.33×10231.33\times10^{23}

B

6.02×10236.{02}\times 10^{23}

C

3.01×10213.01\times 10^{21}

D

1.34×10211.34\times 10^{21}

Answer

1.34×10211.34\times 10^{21}

Explanation

Solution

Mass of magnesium =2.00 g×2.68100=\frac{2.00\,g \times 2.68}{100} =5.36×10−2 g=5.36 \times 10^{-2}\,g 24 g24\,g of Mg=6.02×1023Mg=6.02\times 10^{23} atoms ∴5.36×10−2 g\therefore 5.36\times 10^{-2}\,g of MgMg =(6.02×1023atoms)×(5.36×10−2g)24g=\frac{(6.02\times10^{23} atoms) \times(5.36\times10^{-2}g)}{24g} =1.34×1021=1.34 \times 10^{21} atoms