A) \[1.345\times {{10}^{21}}\]
B) \[1.345\times {{10}^{20}}\]
C) \[13.45\times {{10}^{21}}\]
D) \[1.345\times {{10}^{23}}\]
Correct Answer: A
Solution :
| [a]\[\because \] 100 g chlorophyll contains 2.68 g |
| \[Mg=\frac{2.68}{24}\] mole \[Mg\] |
| \[\therefore \] 2g chlorophyll contains \[\frac{2.68\times 2}{24\times 100}\] mol |
| \[Mg=2.2\times {{10}^{-3}}\]mole \[Mg\] |
| No. of \[Mg\] atoms \[=2.2\times {{10}^{-3}}\times 6.023\times {{10}^{23}}\] |
| \[=1.345\times {{10}^{21}}\] atoms of \[Mg\]. |
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