Multiple Choice
What is the total mass, in grams, of 6 moles of carbon atoms? (Atomic mass of carbon = 12.011 g/mol)
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2. Atoms & Elements
Calculating Molar Mass
Multiple Choice
Which of the following is the correct molar mass (to two decimal places) of C6H12N?
A
98.17 g/mol
B
112.23 g/mol
C
94.13 g/mol
D
110.18 g/mol
Verified step by step guidance1
Identify the molecular formula given: C6H12N, which means the molecule contains 6 carbon (C) atoms, 12 hydrogen (H) atoms, and 1 nitrogen (N) atom.
Find the atomic masses of each element from the periodic table: Carbon (C) ≈ 12.01 g/mol, Hydrogen (H) ≈ 1.008 g/mol, Nitrogen (N) ≈ 14.01 g/mol.
Calculate the total mass contributed by each element by multiplying the number of atoms by their atomic masses: For carbon, multiply 6 by 12.01; for hydrogen, multiply 12 by 1.008; for nitrogen, multiply 1 by 14.01.
Add all these individual masses together to get the molar mass of C6H12N: Molar mass = (6 × 12.01) + (12 × 1.008) + (1 × 14.01).
Round the final sum to two decimal places to find the molar mass and compare it with the given options to identify the correct molar mass.
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