Multiple Choice
The chemical formula for glucose is C_6H_{12}O_6. What is the percent by mass of hydrogen in glucose?
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3. Chemical Reactions
Mass Percent
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What is the mass percent of oxygen in water (H_2O)?
A
88.8%
B
33.3%
C
11.2%
D
50.0%
Verified step by step guidance1
Identify the elements present in water (H\_2O) and their respective quantities: 2 hydrogen atoms and 1 oxygen atom.
Find the atomic masses of hydrogen and oxygen from the periodic table: approximately 1.0 g/mol for hydrogen and 16.0 g/mol for oxygen.
Calculate the molar mass of water by summing the masses of all atoms: \(\text{Molar mass of H\_2O} = 2 \times 1.0 + 1 \times 16.0\) g/mol.
Calculate the mass percent of oxygen in water using the formula: \(\text{Mass \% of oxygen} = \left( \frac{\text{Mass of oxygen}}{\text{Molar mass of H\_2O}} \right) \times 100\%\).
Substitute the values into the formula and simplify to find the mass percent of oxygen in water.
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