A flask contain 8.8g 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 in a flask containing 8.8 g of \( CO_2 \), we can follow these steps:

### Step 1: Identify the mass of \( CO_2 \)
The mass of \( CO_2 \) given in the problem is 8.8 g.

### Step 2: Calculate the molar mass of \( CO_2 \)
The molar mass of \( CO_2 \) can be calculated by adding the atomic masses of its constituent elements:
- The atomic mass of carbon (C) is 12 g/mol.
- The atomic mass of oxygen (O) is 16 g/mol, and since there are 2 oxygen atoms in \( CO_2 \), we multiply this by 2.

\[ \text{Molar mass of } CO_2 = \text{Atomic mass of C} + 2 \times \text{Atomic mass of O} \]
\[ = 12 \, \text{g/mol} + 2 \times 16 \, \text{g/mol} = 12 \, \text{g/mol} + 32 \, \text{g/mol} = 44 \, \text{g/mol} \]

### Step 3: Use the formula to calculate moles
The number of moles (\( n \)) can be calculated using the formula:

\[ n = \frac{\text{mass}}{\text{molar mass}} \]

Substituting the values we have:

\[ n = \frac{8.8 \, \text{g}}{44 \, \text{g/mol}} \]

### Step 4: Perform the calculation
Now, we perform the division:

\[ n = \frac{8.8}{44} = 0.2 \, \text{moles} \]

### Final Answer
The flask contains **0.2 moles of \( CO_2 \)** gas.

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