Question

Calculate the molecular mass of the given molecules. Mg= 24, N= 14, C=12 , H=1, O= 16, Na=23 I. Mg3N2 II. CH3COONa​

Answer 1

Given :

We are given the atomic numbers of -

• Mg as 24
• N as 14
• C as 12
• H as 1
• O as 16
• Na as 23

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To find :

• Molecular mass of $\sf\:Mg_{3}N_{2}$ and $\sf\:CH_{3}COONa$

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Solution :

1) $\sf\:Mg_{3}N_{2}$

Substituting the atomic mass of Mg and N

$\sf\to\:(24)_{3} + (14)_{2}$

$\sf\to\:(24 \times 3) + (14 \times 2)$

$\sf\to\:72+ 28$

$\small{\mathfrak{\to\:100~gram~moles}}$

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2) $\sf\:CH_{3}COONa$

Substituting the atomic mass of C , H , O and Na

$\sf\to\:12 + (1)_{3} + 12 + 16 + 16 + 23$

$\sf\to\:12 + (1 \times 3) + 12 + 16 + 16 + 23$

$\sf\to\:12 + 3 + 12 + 16 + 16 + 23$

$\sf\to\:15 + 12 + 16 + 16 + 23$

$\sf\to\:27+ 16 + 16 + 23$

$\sf\to\:43+ 16 + 23$

$\sf\to\:59+ 23$

$\small{\mathfrak{\to\:82~gram~moles}}$

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$\sf\:How~ to~ find~ molecular ~mass ~?$

➻ We would be given a molecule for which we need to calculate molecular mass.

➻ Using the periodic table we may know their atomic mass.

➻ After substituting the atomic mass we need to multiply it with no of atoms of the element in the molecules.

➻ Finally adding the values we would end up getting the molecular mass of the molecule.

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