객관식
In the chemical formula 2Ca(ClO2)2, how many atoms of oxygen are present?
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2. Atoms & Elements
Calculating Molar Mass
객관식
What is the molar mass of Al(NO3)3?
A
189.99 g/mol
B
213.00 g/mol
C
242.00 g/mol
D
101.96 g/mol
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검증된 단계별 안내1
Identify the chemical formula of the compound: Al(NO3)3, which consists of 1 aluminum (Al) atom and 3 nitrate (NO3) groups.
Determine the atomic masses of each element involved using the periodic table: Aluminum (Al) ≈ 26.98 g/mol, Nitrogen (N) ≈ 14.01 g/mol, Oxygen (O) ≈ 16.00 g/mol.
Calculate the molar mass of one nitrate ion (NO3) by adding the atomic masses: 1 nitrogen atom + 3 oxygen atoms, which is \(14.01 + 3 \times 16.00\) g/mol.
Multiply the molar mass of the nitrate ion by 3 because there are three nitrate groups in the formula: \(3 \times (14.01 + 3 \times 16.00)\) g/mol.
Add the molar mass of aluminum to the total molar mass of the three nitrate ions to get the molar mass of Al(NO3)3: \(26.98 + 3 \times (14.01 + 3 \times 16.00)\) g/mol.
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