Answer:
15 grams of water
Explanation:
15 grams of water of water would lose heat the faster compared to higher masses of water. 
Water generally is a poor conductor heat. 
- To heat up a unit of water, significant amount of energy must be added to the body of water. 
- With time, the body continues to increase in temperature. 
- A 500g mass of water will take more time to lose heat.