Calculate molar mass of following substances. (a) Ethyne, (C₂ H₂) (b) Sulphur molecule, (S₈)

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3. ATOMS AND MOLECULES

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Calculate the molar mass of the following substances.

$(a)$ Ethyne, $(C_2 H_2)$

$(b)$ Sulphur molecule, $(S_8)$

A

$52\,u $ and $265\,u $

B

$26\,u $ and $256\,u $

C

$62\,u $ and $552\,u $

D

$28\,u $ and $320\,u $

Solution

$(a)$ Molar mass of $C_2 H_2$

$=(2 \times$ Atomic mass of $C) $ $+(2 \times$ Atomic mass of $H) $

$=(2 \times 12)+(2 \times 1)$

$=26\,u $

$(b)$ Molar mass of $S_8$

$=(8 \times$ Atomic mass of $S)$

$=8 \times 32=256\,u $

Standard 9

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