객관식
Which of the following is the correct molar mass for the compound FeSO_4?
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2. Atoms & Elements
Calculating Molar Mass
객관식
What is the molar mass of ammonia (NH_3)?
A
17.0 g/mol
B
15.0 g/mol
C
18.0 g/mol
D
16.0 g/mol
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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 nitrogen and hydrogen from the periodic table: nitrogen has an atomic mass of approximately 14.0 g/mol, and hydrogen has an atomic mass of approximately 1.0 g/mol.
Calculate the total mass contributed by nitrogen: multiply the number of nitrogen atoms by its atomic mass: \(1 \times 14.0 = 14.0\) g/mol.
Calculate the total mass contributed by hydrogen: multiply the number of hydrogen atoms by its atomic mass: \(3 \times 1.0 = 3.0\) g/mol.
Add the masses of nitrogen and hydrogen to find the molar mass of ammonia: \(14.0 + 3.0 = 17.0\) g/mol.
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