If you have 50 grams of water, the number of moles of water ...

Question Analysis
This question tests the student's ability to convert the mass of a substance into moles using the molar mass.

Key Concept Explanation
The number of moles of a substance can be calculated using the formula , where is the mass of the substance and is its molar mass.

Step-by-step Solution
1. Identify the given values: and .
2. Use the formula