Multiple Choice
What is the molar mass of aluminum (Al)?
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2. Atoms & Elements
Calculating Molar Mass
Multiple Choice
What is the formula weight (molar mass) of KBr, rounded to two decimal places?
A
167.00 g/mol
B
143.10 g/mol
C
119.00 g/mol
D
80.91 g/mol
Verified step by step guidance1
Identify the elements present in the compound KBr, which are potassium (K) and bromine (Br).
Find the atomic masses of each element from the periodic table: potassium (K) has an atomic mass of approximately 39.10 g/mol, and bromine (Br) has an atomic mass of approximately 79.90 g/mol.
Add the atomic masses of potassium and bromine to find the formula weight (molar mass) of KBr using the formula: \(\text{Molar mass of KBr} = \text{Atomic mass of K} + \text{Atomic mass of Br}\).
Substitute the values into the formula: \(\text{Molar mass of KBr} = 39.10 + 79.90\).
Sum the values to get the total molar mass of KBr, then round the result to two decimal places.
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