How many grams of krypton (Kr) are present in 2.50 moles of krypton?

• A. 209 g
• B. 125 g
• C. 83.8 g
• D. 33.5 g

Answer: (A)

Verified step by step guidance

1. Identify the given quantity: 2.50 moles of krypton (Kr).
2. Recall that to convert moles to grams, you need the molar mass of krypton. Find the molar mass of krypton (Kr) from the periodic table, which is approximately 83.8 g/mol.
3. Use the conversion formula: \(\text{mass (g)} = \text{moles} \times \text{molar mass (g/mol)}\).
4. Substitute the values into the formula: \(\text{mass} = 2.50 \text{ moles} \times 83.8 \text{ g/mol}\).
5. Calculate the product to find the mass of krypton in grams.