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

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

Answer: (A)

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 (do not calculate the final value here, just set up the expression).
5. Interpret the result as the amount of substance in moles present in 22 grams of argon.