객관식
Which of the following steps correctly describes how to determine the molar mass (formula weight) of NaCl?
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2. Atoms & Elements
Calculating Molar Mass
객관식
What is the molar mass of ammonia (NH_3)?
A
16.00 g/mol
B
17.03 g/mol
C
18.02 g/mol
D
15.99 g/mol
검증된 단계별 안내1
Identify the chemical formula of ammonia, which is NH\_3, meaning it contains 1 nitrogen (N) atom and 3 hydrogen (H) atoms.
Find the atomic masses of each element from the periodic table: nitrogen (N) has an atomic mass of approximately 14.01 g/mol, and hydrogen (H) has an atomic mass of approximately 1.008 g/mol.
Calculate the total mass contributed by nitrogen by multiplying the number of nitrogen atoms by its atomic mass: \(1 \times 14.01\) g/mol.
Calculate the total mass contributed by hydrogen by multiplying the number of hydrogen atoms by its atomic mass: \(3 \times 1.008\) g/mol.
Add the masses of nitrogen and hydrogen together to find the molar mass of ammonia: \(14.01 + (3 \times 1.008)\) g/mol.
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