Question

Cartisen is a molecular substance in which there are 21 atoms of carbon of each molecule. The mass percentage of carbon is 69.98%, then what is its molecular mass?

Answer 1

Answer on Question #68951, Physics / Other

Cartisen is a molecular substance in which there are 21 atoms of carbon of each molecule. The mass percentage of carbon is 69.98%, then what is its molecular mass?

Solution:

Mass % of an element = mass of the element in the compound / molar mass of the compound.

Mass of carbon in this compound =

$$= 12.017 \text{ g/mol (atomic mass)} \times 21 \text{ (atoms of carbon)} = 252.2247 \text{ g/mol}$$

According to question we have

$$69.98\% = \frac{252.2247 \text{ g/mol}}{\text{molar mass}} \times 100\%$$

So,

$$\text{Molar mass} = \frac{252.2247 \text{ g/mol}}{69.98\%} \times 100\% = 360.42 \text{ g/mol}$$

Answer: 360.42 g/mol

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