SATHEE: Some Basic Concepts Of Chemistry Question 152

Some Basic Concepts Of Chemistry Question 152

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

Options:

A) $1.345 \times 10^{21}$

B) $1.345 \times 10^{20}$

C) $13.45 \times 10^{21}$

D) $1.345 \times 10^{23}$

Show Answer

Answer:

Correct Answer: A

Solution:

[a] $∵$ 100 g chlorophyll contains 2.68 g $M g = \frac{2.68}{24}$ mole $M g$

$∴$ 2g chlorophyll contains $\frac{2.68 \times 2}{24 \times 100}$ mol $M g = 2.2 \times 10^{- 3}$ mole $M g$ No. of $M g$ atoms $= 2.2 \times 10^{- 3} \times 6.023 \times 10^{23}$

$= 1.345 \times 10^{21}$ atoms of $M g$ .

Some Basic Concepts Of Chemistry Question 152

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

Options:

Answer:

Solution:

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Some Basic Concepts Of Chemistry Question 152

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

Options:

Answer:

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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