Download Specific Heat and Calorimeters

Specific Heat and Calorimeters
Name: ________________
1) 0.100 moles of NaOH are dissolved in 150 grams of water inside a calorimeter. The temperature
goes from 23.0 OC to 30 OC. Find the heat transfer (Q) for the water.
Specific heat (c) water = 4.184 J/g •OC
2) When a 4.25 g sample of solid NH4NO3 dissolves in 60 g of water in a calorimeter, the temperature
drops from 21 OC to 16.9 OC. Calculate the heat (Q) for the solution process.
3) An 18.7 g sample of platinum metal increases in temperature by 2.3 OC when 5.7 J of heat are
added. What is the specific heat of platinum?
4) When a hot, 30g piece of iron is dropped into a calorimeter of water, the temperature increased by
12.3 OC and the heat given off was 14.4 kJ. What was the mass of water in the calorimeter?
5) How much heat energy is needed to raise the temperature of a 425 g aluminum baking sheet
from room temperature, 25 OC, to a baking temperature of 200 OC (the specific heat of aluminum is
0.897 J/g •OC)?
H. Chem
6) How many Joules of heat is released to your body when you drink a cup of hot tea which contains
200. g of water at a temperature of 65 OC and it cools to body temperature (37 OC)?
7) On a cold winter day with a temperature of 4 OC, you pick up a penny from the ground and put in
your pocket. If the penny has a mass of 1.85 grams, how much heat will it absorb from you body as
it warms to your body temperature of 37 OC (the specific heat of copper is 0.385 J/g •OC) ?
8) A swimming pool measures 6.0 m x 12.0 m and has a uniform depth of 3.0 m. The pool is full of
water at a uniform temperature of 20 OC. Given that a cubic meter (m3) of water has a mass of 103
kg, How much heat energy must be released by the pool’s heater to raise
the water temperature to 25 OC?
9) A 5 g piece of copper metal is placed inside a cup of hot water. The copper penny, initially at
25 OC is heated to the temperature of the water, 49 OC. The amount of heat absorbed by the copper
is 67.2 J. What is the specific heat of the copper metal?
10) 25 g of ice at 0 OC is placed in a calorimeter with water at 45 OC. The water when mixed together
reach a final temperature of 31.8 OC. Knowing that whatever heat is lost by the water is gained by
the ice, what mass of water was in the cup?
Answers: 1) 4393 J
2) 1029 J
3) 0.133 J/g •OC
4) 280 g
6) 23430 J
7) 23.5 J
8) 465428160 J
9) 0.56 J/g •OC
5) 66714 J
10) 60 g
H. Chem