Multiple Choice
What is the mass in grams of 2.57 × 10^{23} molecules of I_2?
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2. Atoms & Elements
Calculating Molar Mass
Multiple Choice
What is the total number of atoms present in one molecule of Al2(S2O3)3?
A
14
B
21
C
23
D
17
Verified step by step guidance1
Identify the chemical formula given: Al\_2(S\_2O\_3)\_3. This means the molecule contains aluminum (Al), sulfur (S), and oxygen (O) atoms.
Determine the number of each type of atom inside the parentheses first. The group (S\_2O\_3) contains 2 sulfur atoms and 3 oxygen atoms.
Since the group (S\_2O\_3) is multiplied by 3, multiply the number of sulfur and oxygen atoms by 3: sulfur atoms = 2 \(\times\) 3, oxygen atoms = 3 \(\times\) 3.
Count the aluminum atoms outside the parentheses: there are 2 aluminum atoms.
Add all the atoms together to find the total number of atoms in one molecule: total atoms = aluminum atoms + total sulfur atoms + total oxygen atoms.
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