Answer to Question #77944 in General Chemistry for Chloe Lozano

Question

_______ is the amount of heat necessary to increase the temperature of 1 gram of H2O by 1 degree Kelvin.

A. Calorie
B. Energy
C. Heat
D. A Joule
E. Work

Answer 1

Calorie is an off-system unit for the amount of heat. This quantity of heat depends on
1). the atmospheric pressure;
2). the starting temperature of the water.
Due to this, the definition should be supplemented with the following words: calorie (cal) is the amount of heat necessary to increase the temperature of 1 gram of H2O by 1 degree Kelvin at a pressure of one atmosphere (101325 kPa).
According to the starting temperature of the water, there are different types of calories. Different temperatures yield different types of calories.
So, the definition in the task refers to the thermochemical calorie (calth). 1 calth is defined as 4.184 J.
Answer: A.