Multiple Choice
How many atoms are present in one formula unit of the compound FeC5O5?
2. Atoms & Elements
Calculating Molar Mass
Multiple Choice
What is the mass (in grams) of 7.98 moles of krypton (Kr)?
A
669 g
B
319 g
C
228 g
D
7.98 g
Verified step by step guidance1
Identify the given quantity and what is asked: You have 7.98 moles of krypton (Kr) and need to find the mass in grams.
Recall the relationship between moles, molar mass, and mass: \(\text{mass} = \text{moles} \times \text{molar mass}\).
Find the molar mass of krypton (Kr) from the periodic table. The molar mass is the atomic mass expressed in grams per mole (g/mol).
Multiply the number of moles (7.98 mol) by the molar mass of krypton to calculate the mass in grams.
Write the final expression for mass: \(\text{mass} = 7.98 \; \text{mol} \times \text{molar mass of Kr} \; (\text{g/mol})\) and solve to get the mass.
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