How much heat is necessary to change 30 g of water at 10°C into water at 80°C?
A) 0.21 kcal
B) 2.1 kcal
C) 4.5 kcal
D) 0.51 kcal

Question

Quizplus · Accepted Answer

The amount of heat required can be calculated using the formula Q = mcΔT, where m is the mass of the water (30g), c is the specific heat capacity of water (1 cal/g°C), and ΔT is the change in temperature (80°C - 10°C = 70°C). Thus, Q = 30g * 1 cal/g°C * 70°C = 2100 cal = 2.1 kcal.

How Much Heat Is Necessary to Change 30 G of Water