Multiple Choice
How many grams of Fe_2O_3 are present in 0.500 mole of Fe_2O_3?
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2. Atoms & Elements
Calculating Molar Mass
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How many total atoms are present in one formula unit of Al_2(CO_3)_3?
A
12
B
17
C
14
D
9
Verified step by step guidance1
Identify the chemical formula given: Al_2(CO_3)_3. This represents one formula unit of aluminum carbonate.
Break down the formula into its constituent atoms and count how many of each atom are present:
- Aluminum (Al): There are 2 atoms of Al as indicated by the subscript 2.
- Carbon (C): The carbonate ion (CO_3) has 1 carbon atom, and there are 3 carbonate ions, so total carbon atoms = 3 × 1 = 3.
- Oxygen (O): Each carbonate ion has 3 oxygen atoms, and there are 3 carbonate ions, so total oxygen atoms = 3 × 3 = 9.
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