Question

‘X’ is molecular substance containing 21 atoms of carbon per molecule. The weight % of C in ‘X’ is 50.4%. then mass of one molecule of X ( multi correct answer )
A) 8.35x10-25 kg
B) 8.35x10-3mg
C) 835x10-22gm
D) 500amu​

Answer 1

Answer:

The answer is a option A

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Answer 2

The molar mass of X is 500amu.

Given: X’ is a molecular substance containing 21 atoms of carbon per molecule. The weight % of C in ‘X’ is 50.4%.

To find The molar mass of X.

Solution:

The mass of one carbon atom is 12 grams.

The molecule X contains 21 carbon atoms so, the total weight will be-

$21 \times 12 = 252$

Let the molar mass of X be y.

The weight % of C in ‘X’ is 50.4%.

So, we can write-

$\frac{252}{y} = 50.4\% \\ \frac{252}{y} = 0.504 \\ y = \frac{252}{0.504} \\ y = 500$

The value of y is 500.

The molar mass of X is 500amu.