Question

18) Chlorophyll contains 2.7% Mg. Hence
the number Mg atoms present in 0.1 mg
of chlorophyll is
A) 6.75 x 1016 B) 6.75 X 1021
C) 8.84 x 1019 D) 3.63 x 1018​

Answer 1

Answer:

a. 6.75×10¹⁶

Explanation:

mass of chlorophyll = 2.7/100×0.1

= 2.7/1000 = 0.0027gm

moles = 0.0027/24

=0.0001125 moles

atoms = 0.0027/24 × AVOGADRO’S number (6.022×10²²)

= 6.75×10¹⁶

hope it helps:)

Answer 2

Correct question is "Chlorophyll contains 2.7% Mg. Hencethe number Mg atoms present in 0.1 mgof chlorophyll isA) 6.75 x 10¹⁶ B) 6.75 X 10²¹C) 8.84 x 10¹⁹ D) 3.63 x 10¹⁸"

Answer:

The number of Mg atoms present in 0.1 mg

of chlorophyll is $6.75 \times {10}^{16}$

So, option A is the correct answer.

Explanation:

Given, Chlorophyll contains 2.7% Mg

So,mass of Chlorophyll

$= \frac{2.7}{1000} \times 0.1 \\ = 0.0027 \: gm$

Moles numbers in chlorophyll $= \frac{0.0027}{24} = 0.0001125 \: moles$

Therefore numbers of Mg atoms in Chlorophyll

$= \frac{0.0027}{24} \times Avogadro \: numbers \\ = \frac{0.0027}{24} \times 6.022 \times {10}^{22} \\ = 6.75 \times {10}^{16}$

Here applied relation is

Avogadro numbers $= 6.022 \times {10}^{22}$

Extra information about Magnesium:

A chemical element with the symbol Mg and atomic number 12 is called magnesium. It is a shiny gray solid that shares many physical and chemical properties with the other five alkaline earth metals. This element is produced in large, aging stars by the sequential addition of three helium nuclei to a carbon nucleus.

Magnesium has many important functions in the body, such as supporting muscle and nerve function and energy production. Low magnesium levels usually do not cause symptoms. However, chronically low levels can increase the risk of heart disease,high blood pressure,osteoporosis and type 2 diabetes .

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