Question

Question No. 63
What will be the minimum molecular mass of chlorophyll having 0.24% by mass of Mg? (Given : atomic mass of Mg = 24)
O 102 amu
O 104 amu
O 24 amu
O 24 x 104 amu
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Answer 1

Explanation:

2 grams of chlorophyll would contain 0.0268*2 gram of Magnesium(2.68% of 2 gram) which is equal to 0.0536 gram. One mole(6.022 times 10^23) atoms of Magnesium weight 24 grams( atomic mass). Hence 0.0536 grams of Magnesium would contain 1.3449 times 10^21 atoms.