Multiple Choice
If you have a solution containing 120 g of NaCl dissolved in 480 g of water, what is the mass percent of NaCl in the solution?
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3. Chemical Reactions
Mass Percent
Multiple Choice
What is the mass percent of oxygen (O) in carbon dioxide (CO_2)? Provide your answer to two decimal places.
A
66.67%
B
72.73%
C
44.00%
D
27.27%
Verified step by step guidance1
Identify the chemical formula of carbon dioxide, which is \(\mathrm{CO_2}\), meaning it contains 1 carbon atom and 2 oxygen atoms.
Find the atomic masses of carbon and oxygen from the periodic table: approximately 12.01 g/mol for carbon and 16.00 g/mol for oxygen.
Calculate the molar mass of carbon dioxide by adding the atomic mass of carbon and twice the atomic mass of oxygen: \(M_{\mathrm{CO_2}} = 12.01 + 2 \times 16.00\) g/mol.
Calculate the total mass of oxygen in one mole of carbon dioxide: \(M_{\mathrm{Oxygen}} = 2 \times 16.00\) g/mol.
Determine the mass percent of oxygen in carbon dioxide using the formula: \(\text{Mass \% of O} = \left( \frac{M_{\mathrm{Oxygen}}}{M_{\mathrm{CO_2}}} \right) \times 100\%\).
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