Calculate the molecular mass of the following substances:

(a) Ethyne $(C_{2} H_{2})$

(b) Sulphur molecule $(S_{8})$

(c) Phosphorus molecule $(P_{4})$

(d) Hydrochloric acid $(H C l)$

(e) Nitric acid $(H N O_{3})$

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Solution

(a) Ethyne $(C_{2} H_{2})$
Molecular mass of ethyne $(C_{2} H_{2})$ = 2 x 12 + 2 x 1 = 26 u

(b) Sulphur molecule $(S_{8})$
Molecular mass of sulphur molecule $(S_{8})$
= 8 x 32 = 256 u

(c) Phosphorus molecule $(P_{4})$
Molecular mass of phosphorus molecule $(P_{4})$ = 4 x 31 = 124 u

(d) Hydrochloric acid $(H C l)$
Molecular mass of hydrochloric acid, $(H C l)$ = 1 + 35.5 = 36.5 u

(e) Nitric acid $(H N O_{3})$
Molecular mass of nitric acid $(H N O_{3})$ = 1 + 14 + 3 x 16 = 63 u

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Similar questions

Calculate the molar mass of the following substances:

(a) Ethyne, C₂H₂

(b) Sulphur molecule, S₈

(d) Hydrochloric acid, HCl

(e) Nitric acid, HNO₃

C_{2} H_{2}

S_{8}

P_{4}

H N O_{3}

H C l

Calculate the molar mass of the following substances [3 MARKS]
1. Ethyne, C₂H₂
2. Nitric acid, HNO₃
3. Methane, CH₄

{H N O}_{3}

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