객관식
What is the molar mass of potassium nitrate (KNO_3)?
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2. Atoms & Elements
Calculating Molar Mass
객관식
What is the molar mass of NH_3?
A
15.0 g/mol
B
17.0 g/mol
C
16.0 g/mol
D
18.0 g/mol
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검증된 단계별 안내1
Identify the chemical formula of the compound, which is NH_3 (ammonia).
Determine the atomic masses of each element from the periodic table: nitrogen (N) has an atomic mass of approximately 14.0 g/mol, and hydrogen (H) has an atomic mass of approximately 1.0 g/mol.
Count the number of atoms of each element in the formula: there is 1 nitrogen atom and 3 hydrogen atoms in NH_3.
Calculate the total mass contributed by each element by multiplying the atomic mass by the number of atoms: for nitrogen, multiply 14.0 g/mol by 1; for hydrogen, multiply 1.0 g/mol by 3.
Add the masses of all atoms together to find the molar mass of NH_3: total molar mass = (14.0 g/mol) + (3 × 1.0 g/mol).
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