Question

How many grams are in 6.4 moles of CO2 ?
Responses

44 g
44 g

588 g
588 g

281.6 g
281.6 g

181 g

Answer 1

To find the mass of 6.4 moles of CO2, you can use the molar mass of carbon dioxide.

The molar mass of CO2 is calculated as follows:

- Carbon (C): 12.01 g/mol
- Oxygen (O): 16.00 g/mol (there are two oxygen atoms in CO2)

So the molar mass of CO2 = 12.01 g/mol + (16.00 g/mol × 2) = 12.01 g/mol + 32.00 g/mol = 44.01 g/mol.

Now, to convert moles to grams, use the formula:

\[
\text{mass (g)} = \text{moles} \times \text{molar mass (g/mol)}
\]

For 6.4 moles of CO2:

\[
\text{mass} = 6.4 \, \text{moles} \times 44.01 \, \text{g/mol} \approx 281.664 \, \text{g}
\]

Rounding to the appropriate number of significant figures, you get approximately 281.6 g.

Therefore, the correct answer is **281.6 g**.