Question:
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
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
Updated On: Jun 23, 2023
- $1.33\times10^{23}$
- $6.{02}\times 10^{23}$
- $3.01\times 10^{21}$
- $1.34\times 10^{21}$
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The Correct Option is D
Solution and Explanation
Mass of magnesium $=\frac{2.00\,g \times 2.68}{100}$
$=5.36 \times 10^{-2}\,g$
$24\,g$ of $Mg=6.02\times 10^{23}$ atoms
$\therefore 5.36\times 10^{-2}\,g$ of $Mg$
$=\frac{(6.02\times10^{23} atoms) \times(5.36\times10^{-2}g)}{24g}$
$=1.34 \times 10^{21}$ atoms
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Chemistry is a vast subject and for understanding its significance we can take help of following points:
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Classification of Matter
There are two ways of classifying the matter:
(A) Physical Classification:
Matter can exist in three physical states:
- Solids - have definite volume and definite shape
- Liquids - have definite volume but not definite shape.
- Gases - have neither definite volume nor definite shape.
(B) Chemical Classification:
Based upon the composition, matter can be divided into two main types:
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