A flask contain 132g of `CO_2` gas. Calculate how many moles of` CO_2` gas does it contain?

Options

A. 1
B. 2
C. 3
D. 4

Explanation

To calculate the number of moles of \( CO_2 \) gas in a flask containing 132 grams, we can follow these steps:

### Step 1: Identify the given mass of \( CO_2 \)
The mass of \( CO_2 \) is given as:
\[ \text{Mass of } CO_2 = 132 \text{ grams} \]

### Step 2: Calculate the molar mass of \( CO_2 \)
The molar mass of \( CO_2 \) can be calculated using the atomic masses of carbon and oxygen:
- Atomic mass of carbon (C) = 12 g/mol
- Atomic mass of oxygen (O) = 16 g/mol

Since there are 2 oxygen atoms in \( CO_2 \):
\[ \text{Molar mass of } CO_2 = \text{Atomic mass of C} + 2 \times \text{Atomic mass of O} = 12 + 2 \times 16 = 12 + 32 = 44 \text{ g/mol} \]

### Step 3: Use the formula to calculate the number of moles
The number of moles (\( n \)) can be calculated using the formula:
\[ n = \frac{\text{mass}}{\text{molar mass}} \]
Substituting the values:
\[ n = \frac{132 \text{ grams}}{44 \text{ g/mol}} = 3 \text{ moles} \]

### Conclusion
The flask contains **3 moles** of \( CO_2 \) gas.

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