Chlorophyll, the green colouring matter of plants contains $2.68 %$ of magnesium by weight. Calculate the number of magnesium atoms in $2.00 g$ of chlorophyll?
(Atomic mass of $M g = 24$ )

1.3 \times 10^{20}

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1.3 \times 10^{21}

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1.3 \times 10^{22}

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1.2 \times 10^{23}

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Solution

The correct option is B $1.3 \times 10^{21}$
Given amount of chlorophyll $= 2.0 g m$
given amount of magnesium $= 2.68$
Mass of $M g$ in $2.0 g m$ of chlorophyll $= \frac{2.68 \times 2}{100} = 0.054 g m$ .
$6 \times 10^{23}$ atoms of magnesium $= 24 g m$
$24 g m$ of $M g$ contains $6.022 \times 10^{23}$
$0.054 g$ of $M g$ contains $= \frac{6.022 \times 10^{23} \times 24}{0.054} = 1.3 \times 10^{21}$

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Q. Chlorophyll contains 2.68% of magnesium by mass. Calculate the number of magnesium atoms in 3.00 gms of chlorophyll.

State true or false with calculations

Chlorophyll contains 2.68% of magnesium by mass.The number of Mg atoms in 3g of chlorophyll is 2.01 × 10²¹atoms.

Chlorophyll the green pigment a complex of magnesium contains 2.68 % of magnesium by weight. Calculate the number of magnesium atoms in 5 gram of the chlorophyll.

Please explain in detail.

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Chlorophyll, the green colouring matter of plants contains 2.68% of magnesium by weight. Calculate the number of magnesium atoms in 2.00 g of chlorophyll?(Atomic mass of Mg=24)

The correct option is B 1.3×1021Given amount of chlorophyll =2.0gmgiven amount of magnesium =2.68Mass of Mg in 2.0gm of chlorophyll =2.68×2100=0.054gm.6×1023 atoms of magnesium =24gm24gm of Mg contains 6.022×10230.054g of Mg contains =6.022×1023×240.054=1.3×1021

Chlorophyll, the green colouring matter of plants contains $2.68 %$ of magnesium by weight. Calculate the number of magnesium atoms in $2.00 g$ of chlorophyll?
(Atomic mass of $M g = 24$ )