Multiple Choice
What mass (in kg) does 5.01 moles of iron (Fe) have? (Molar mass of Fe = 55.85 g/mol)
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- 1. Intro to General Chemistry3h 48m
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2. Atoms & Elements
Calculating Molar Mass
Multiple Choice
How many atoms are present in one formula unit of magnesium hydroxide, Mg(OH)_2?
A
3
B
4
C
7
D
5
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Verified step by step guidance1
Identify the chemical formula given: Mg(OH)\_2, which represents magnesium hydroxide.
Break down the formula into its constituent atoms: Mg, O, and H.
Count the number of each type of atom in one formula unit: 1 magnesium (Mg), 2 oxygen (O) atoms (because of the subscript 2 outside the parentheses), and 2 hydrogen (H) atoms (also multiplied by 2).
Add the total number of atoms together: 1 (Mg) + 2 (O) + 2 (H).
Sum these values to find the total number of atoms in one formula unit of Mg(OH)\_2.
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