A flask contain 88g 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 contained in a flask with a mass of 88 grams, we can follow these steps:

### Step 1: Determine the molar mass of \( CO_2 \)

The molar mass of \( CO_2 \) (carbon dioxide) can be calculated by adding the atomic masses of its constituent elements:
- Carbon (C) has an atomic mass of 12 g/mol.
- Oxygen (O) has an atomic mass of 16 g/mol, and there are 2 oxygen atoms in \( CO_2 \).

So, the molar mass of \( CO_2 \) is calculated as follows:

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

### Step 2: Use the formula to calculate moles

The number of moles (\( n \)) can be calculated using the formula:

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

Given that the mass of \( CO_2 \) is 88 grams, we can substitute the values into the formula:

\[ n = \frac{88 \, \text{g}}{44 \, \text{g/mol}} \]

### Step 3: Perform the calculation

Now, we perform the division:

\[ n = \frac{88}{44} = 2 \, \text{moles} \]

### Conclusion

Thus, the flask contains **2 moles** of \( CO_2 \) gas.

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