Question

Which of the following would require the
greatest number of calories?
1. Heating 10 g of water from 10◦C to 40◦C
2. Heating 1000 g of water from 10◦C to 12◦C
3. Heating 100 g of water from 10◦C to 50◦C
4. Heating 1 g of water from 10◦C to 80◦C

Answer 1

1)

$$Q=(10)(40-10)=300\ calories$$

2)

$$Q=(1000)(12-10)=2000\ calories$$

3)

$$Q=(100)(50-10)=4000\ calories$$

4)

$$Q=(1)(80-10)=70\ calories$$

Answer: 3. Heating 100 g of water from 10◦C to 50◦C