Multiple Choice
What is the mass, in grams, of 8 moles of sodium chloride (NaCl)?
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2. Atoms & Elements
Calculating Molar Mass
Multiple Choice
Which of the following is the correct molar mass for the compound FeSO_4?
A
135.86 g/mol
B
169.87 g/mol
C
151.91 g/mol
D
123.82 g/mol
Verified step by step guidance1
Identify the chemical formula of the compound, which is FeSO_4, consisting of one iron (Fe) atom, one sulfur (S) atom, and four oxygen (O) atoms.
Find the atomic masses of each element from the periodic table: Fe ≈ 55.85 g/mol, S ≈ 32.07 g/mol, and O ≈ 16.00 g/mol.
Calculate the total mass contributed by each element by multiplying the atomic mass by the number of atoms in the formula: Fe (1 × 55.85), S (1 × 32.07), O (4 × 16.00).
Sum the masses of all elements to find the molar mass of FeSO_4 using the formula: \(\text{Molar mass} = (1 \times 55.85) + (1 \times 32.07) + (4 \times 16.00)\).
Compare the calculated molar mass with the given options to determine which value matches the correct molar mass of FeSO_4.
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