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Find the molecular mass(in kilogram) of ammonia molecule ${NH}_{3}$ .

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5.62

✕

10^{- 20}

4.82

✕

10^{- 23}

3.72

✕

10^{- 24}

2.82

✕

10^{- 26}

answer is D.

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Detailed Solution

Given,

{NH}_{3}

ammonia we have three hydrogen atoms and one nitrogen atom
Hydrogen

\Rightarrow

3 x 1.00784 g/mol = 3.02352 g/mol
Nitrogen

\Rightarrow

1 x 14.0067 g/mol = 14.0067 g/mol
total molecular mass of

{NH}_{3}

= 3.02352 + 14.0067= 17.03022 g/mol
Mass of one

{NH}_{3}

molecule=

\frac{17.03022}{2.828 ✕ 10^{23}}

= 2.82

✕

10^{- 23}

g or 2.82

✕

10^{- 26}

kg.

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