Which of the following could be an acceptable molecular mass of a compound with an empirical formula of $C H_{2}$ ?

56 g / m o l

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62 g / m o l

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39 g / m o l

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26 g / m o l

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Solution

The correct option is B $56 g / m o l$
Let molecular formula of compound $= (C H_{2})_{n} = C_{n} H_{2 n}$
The molar mass of $= C_{n} H_{2 n} = n (12 + 2) = 14 n$
Molar mass should be multiple of 14.
$\Rightarrow 14 n = 56$
$\Rightarrow n = 4$

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Which of the following could be an acceptable molecular mass of a compound with an empirical formula of CH2?

The correct option is B 56 g/molLet molecular formula of compound =(CH2)n=CnH2nThe molar mass of =CnH2n=n(12+2)=14nMolar mass should be multiple of 14.⇒14n=56⇒n=4

Which of the following could be an acceptable molecular mass of a compound with an empirical formula of $C H_{2}$ ?

The correct option is B $56 g / m o l$
Let molecular formula of compound $= (C H_{2})_{n} = C_{n} H_{2 n}$
The molar mass of $= C_{n} H_{2 n} = n (12 + 2) = 14 n$
Molar mass should be multiple of 14.
$\Rightarrow 14 n = 56$
$\Rightarrow n = 4$