A gas has vapour density $8.5$ . Which of the following could it be?

Answer: B

Molar mass = 2 x vapour density = 17 g/mol.

NH X_{3}

= 14 + 3 = 17.

CH X_{4}

= 16,

H X_{2} O

= 18,

HCl

= 36.5.

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