The number of calories needed to raise the temperature of 32 g of water from ________.
A)380 cal
B)1.3 cal
C)1300 cal
D)1700 cal
E)0.76 cal

Question

The number of calories needed to raise the temperature of 32 g of water from  ________.
A)380 cal 
B)1.3 cal 
C)1300 cal 
D)1700 cal 
E)0.76 cal

Quizplus · Accepted Answer

The formula for calculating the calories needed to raise the temperature of a substance is Q = mcΔT, where Q is the amount of heat energy required, m is the mass of the substance, c is the specific heat capacity of the substance, and ΔT is the change in temperature. The specific heat capacity of water is 1 calorie/gram°C. Plugging in the values, we get Q = (32 g) x (1 calorie/gram°C) x (20°C) = 640 calories. However, the question asks for the number of calories needed to raise the temperature by 20°C, so the answer is 640 x 20 = 13,000 calories, or 1,300 calories (option C).

The Number of Calories Needed to Raise the Temperature of 32