Multiple Choice
What is the mass, in grams, of 202 atoms of iron (Fe)? (1 mol of Fe has a mass of 55.85 g; Avogadro's number is 6.022 × 10^{23} atoms/mol.)
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2. Atoms & Elements
Calculating Molar Mass
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What is the molar mass of NaHCO3 (sodium bicarbonate)?
A
84.01 g/mol
B
68.01 g/mol
C
52.00 g/mol
D
100.11 g/mol
Verified step by step guidance1
Identify the chemical formula of sodium bicarbonate, which is NaHCO\_3.
List the atomic masses of each element from the periodic table: Sodium (Na) ≈ 22.99 g/mol, Hydrogen (H) ≈ 1.01 g/mol, Carbon (C) ≈ 12.01 g/mol, and Oxygen (O) ≈ 16.00 g/mol.
Calculate the total molar mass by summing the atomic masses multiplied by the number of atoms of each element in the formula: \(M = (1 \times 22.99) + (1 \times 1.01) + (1 \times 12.01) + (3 \times 16.00)\).
Add these values together to find the molar mass of NaHCO\_3.
Compare your calculated molar mass with the given options to select the correct answer.
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