How many moles are present in 22 grams of argon (Ar)? (Atomic mass of Ar = 39.95 g/mol)

• A. 0.25 moles
• B. 2.00 moles
• C. 1.00 moles
• D. 0.55 moles

Answer: (D)

Verified step by step guidance

1. Identify the given information: mass of argon (Ar) is 22 grams, and the atomic mass of argon is 39.95 g/mol.
2. Recall the formula to calculate moles from mass: \(\text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}}\).
3. Substitute the given values into the formula: \(\text{moles} = \frac{22}{39.95}\).
4. Perform the division to find the number of moles of argon present in 22 grams.
5. Compare the calculated value with the provided options to identify the correct number of moles.