Multiple Choice
What is the mass in grams of 0.250 mol of the common antacid calcium carbonate (CaCO_3)?
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2. Atoms & Elements
Calculating Molar Mass
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Which of the following compounds has the smallest molar mass?
A
CO_2
B
H_2O
C
NH_3
D
CH_4
Verified step by step guidance1
Identify the molecular formula of each compound: CO_2 (carbon dioxide), H_2O (water), NH_3 (ammonia), and CH_4 (methane).
Determine the atomic masses of each element involved using the periodic table: Carbon (C) ≈ 12 g/mol, Oxygen (O) ≈ 16 g/mol, Hydrogen (H) ≈ 1 g/mol, Nitrogen (N) ≈ 14 g/mol.
Calculate the molar mass of each compound by summing the atomic masses of all atoms in its formula. For example, for CO_2: molar mass = 1 × 12 + 2 × 16.
Repeat the calculation for H_2O, NH_3, and CH_4 using their respective atomic compositions.
Compare the calculated molar masses of all four compounds to determine which one has the smallest molar mass.
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