Multiple Choice
What is the mass percent of oxygen (O) in carbon dioxide (CO_2)? Provide your answer to two decimal places.
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3. Chemical Reactions
Mass Percent
Multiple Choice
Determine the percent composition of nitrogen and oxygen with nitrogen dioxide, NO2.
A
25.0% N and 75.0% O
B
15.5% N and 84.5% O
C
30.4% N and 69.6% O
D
69.6% N and 30.4% O
Verified step by step guidance1
Calculate the molar mass of nitrogen dioxide (NO₂) by adding the atomic masses of nitrogen (N) and oxygen (O). The atomic mass of N is approximately 14.01 g/mol, and the atomic mass of O is approximately 16.00 g/mol. Since there are two oxygen atoms, the molar mass of NO₂ is calculated as: Molar mass of NO₂ = 14.01 g/mol (N) + 2 × 16.00 g/mol (O).
Determine the mass contribution of nitrogen in one mole of NO₂. Since there is one nitrogen atom in NO₂, the mass contribution of nitrogen is simply the atomic mass of nitrogen, which is 14.01 g/mol.
Calculate the percent composition of nitrogen in NO₂ by dividing the mass contribution of nitrogen by the molar mass of NO₂ and multiplying by 100 to convert it to a percentage: Percent composition of N = (Mass of N / Molar mass of NO₂) × 100.
Determine the mass contribution of oxygen in one mole of NO₂. Since there are two oxygen atoms, the mass contribution of oxygen is 2 × 16.00 g/mol.
Calculate the percent composition of oxygen in NO₂ by dividing the mass contribution of oxygen by the molar mass of NO₂ and multiplying by 100 to convert it to a percentage: Percent composition of O = (Mass of O / Molar mass of NO₂) × 100.
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