Question

How many calories are required to raise the temperature of 75.0 g of water from 20°C to 50°C?



A. 1.50 × 10^3 cal
B. 2250 cal
C. 3750 cal
D. 75.0 cal

Answer 1

1 calorie is defined as the energy needed to raise the temperature of 1 gram of water by 1 degree celsius.

so if you have 75 grams, and you change the temp 30 degrees

\(75~grams*30^o C*\dfrac{1cal}{^oC*g}\)=2250 cal