How many moles of CO_2 are present in a 220.-gram sample of CO_2, given that the gram-formula mass of CO_2 is 44 g/mol?

• A. 44 moles
• B. 220 moles
• C. 0.20 moles
• D. 5.0 moles

Answer: (D)

Verified step by step guidance

1. Identify the given information: the mass of the CO_2 sample is 220 grams, and the gram-formula mass (molar mass) of CO_2 is 44 g/mol.
2. Recall the formula to calculate moles from mass and molar mass: \(\text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}}\).
3. Substitute the given values into the formula: \(\text{moles} = \frac{220}{44}\).
4. Perform the division to find the number of moles of CO_2 in the sample.
5. Interpret the result as the amount of substance in moles present in the 220-gram CO_2 sample.