Questions: What is the mass of 3.25 moles of water? Show your calculations.

Solution Steps

The chemical formula for water is \( \text{H}_2\text{O} \). To find the molar mass, we sum the atomic masses of hydrogen and oxygen:

• Hydrogen (H): \( 1.008 \, \text{g/mol} \)
• Oxygen (O): \( 16.00 \, \text{g/mol} \)

Since there are 2 hydrogen atoms and 1 oxygen atom in a water molecule: \[ \text{Molar mass of } \text{H}_2\text{O} = 2 \times 1.008 \, \text{g/mol} + 16.00 \, \text{g/mol} = 18.016 \, \text{g/mol} \]

To find the mass of 3.25 moles of water, we use the formula: \[ \text{Mass} = \text{Number of moles} \times \text{Molar mass} \]

Substituting the given values: \[ \text{Mass} = 3.25 \, \text{moles} \times 18.016 \, \text{g/mol} = 58.552 \, \text{g} \]

Final Answer