120 g of an organic compound that contains only carbon and hydrogen gives 330 g of `CO_2` and 270 g of water on complete combustion. The percentage of carbon and hydrogen, respectively are

Options

A. 25 and 75
B. 40 and 60
C. 60 and 40
D. 75 and 25

Explanation

To find the percentage of carbon and hydrogen in the organic compound, we can follow these steps:

### Step 1: Calculate the mass of carbon from CO₂ produced
The mass of carbon in the organic compound can be determined from the mass of carbon dioxide (CO₂) produced during combustion. The molar mass of CO₂ is approximately 44 g/mol, and each mole of CO₂ contains one mole of carbon (C), which has a molar mass of about 12 g/mol.

Given:
- Mass of CO₂ produced = 330 g

...