What is the mass (in grams) of 3.99 moles of krypton (Kr)?

• A. 83.8 g
• B. 47.8 g
• C. 334 g
• D. 159 g

Answer: (C)

Verified step by step guidance

1. Identify the given quantity and what is asked: You have 3.99 moles of krypton (Kr) and need to find the mass in grams.
2. Find the molar mass of krypton (Kr) from the periodic table. The molar mass is the mass of one mole of krypton atoms, typically given in grams per mole (g/mol).
3. Use the relationship between moles, molar mass, and mass: \(\\text{mass} = \\text{moles} \\times \\text{molar mass}\).
4. Substitute the given number of moles (3.99 moles) and the molar mass of krypton into the formula.
5. Calculate the product to find the mass in grams of 3.99 moles of krypton.