Question

Find the molecular mass of:

(a) H2S (b) HCl (c) NH3 (d) Cl2 (e) CH3COOH (f) CH3CHO​

Answer 1

Answer:

(a) H2S (f) CH3CHO (c) NH3

Explanation:

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Answer 2

$\sf{\huge{\underline{\purple{Answer :-}}}}$

Find the molecular mass of :-

• H2S

➝ Molecular mass of H = 1

Molecular mass of S = 32

H2S = 2 × 1 + 32 = 34

Hence, H2S is 34 amu.

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• HCl

➝ Molecular mass of H = 1

Molecular mass of Cl = 35

HCl = 1 + 35 = 36

Hence, HCl is 36 amu.

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• NH3

➝ Molecular mass of N = 14

Molecular mass of H = 1

NH3 = 14.5 + 1 ≈ 15

Hence, NH3 is 15 amu approx.

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• Cl2

➝ Molecular mass of Cl = 35

Molecular mass of Cl2 = 35 × 2

Cl2 = 35 × 2

➝ 70

Hence, cl2 is 70 amu approx.

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• CH3COOH

➝ Molecular mass of C = 12

Molecular mass of H = 1

Molecular mass of O = 16

CH3COOH = 12 + 3 × 1 + 12 + 16 + 16 + 1

Hence, CH3COOH is 60 amu approx.

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• CH3CHO

➝ Molecular mass of C = 12

Molecular mass of H = 1

Molecular mass of O = 16

CH3CHO = 12 + 3 × 1 + 12 + 1 + 16 ≈ 44

Hence, CH3CHO is 44 amu approx.

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$\sf{\huge{\underline{\orange{About :-}}}}$

The molecular mass of a substance may be defined as the mass of a molecule of a substance relative to the mass of an atom of hydrogen as 1.008 or of Oxygen taken as 16.00 or the mass of one atom of carbon taken as 12.