A flask contain 4.4g of `CO_2` gas. Calculate how many moles of` CO_2` gas does it contain?

Options

A. 0.1
B. 0.2
C. 0.3
D. 0.4

Explanation

To calculate the number of moles of \( CO_2 \) gas contained in a flask with a mass of 4.4 grams, we can follow these steps:

### Step 1: Determine the molar mass of \( CO_2 \)
- The molecular formula for carbon dioxide is \( CO_2 \), which consists of one carbon atom and two oxygen atoms.
- The atomic mass of carbon (C) is approximately 12 g/mol.
- The atomic mass of oxygen (O) is approximately 16 g/mol.
- Therefore, the molar mass of \( CO_2 \) can be calculated as follows:
\[ \text{Molar mass of } CO_2 = \text{mass of C} + 2 \times \text{mass of O} = 12 \, \text{g/mol} + 2 \times 16 \, \text{g/mol} = 12 \, \text{g/mol} + 32 \, \text{g/mol} = 44 \, \text{g/mol} \]

### Step 2: Use the formula to calculate the number of moles
- The number of moles (n) can be calculated using the formula:
\[ n = \frac{\text{given mass}}{\text{molar mass}} \]
- Here, the given mass of \( CO_2 \) is 4.4 grams, and the molar mass we calculated is 44 g/mol.
- Plugging in the values:
\[ n = \frac{4.4 \, \text{g}}{44 \, \text{g/mol}} = 0.1 \, \text{moles} \]

### Conclusion
- The flask contains **0.1 moles** of \( CO_2 \) gas.