A sample of an unknown substance has a mass of 0.465 kg. If 3,000.0 J of heat is required to heat the substance from 50.0°C to 100.0°C, what is the specific heat of the substance?
Use q equals m C subscript p Delta T..
A). 0.00775 J/(gi°C)
B). 0.0600 J/(gi°C)
C). 0.129 J/(gi°C)
D). 0.155 J/(gi°C)
Answers
Answer:
Which of the following has the smallest heat capacity?
3.0 g PB
Which of the following would release the most heat upon cooling from 75°C to 50°C?
A
A cube of iron (Cp = 0.450 J/g•°C) with a mass of 55.8 g is heated from 25.0°C to 48.5°C. How much heat is required for this process? Round your answer to three significant figures.
590
A sample of tin (Cp = 0.227 J/g•°C) is placed in a freezer. Its temperature decreases from 15.0°C to −10.0°C as it releases 543 J of energy. What is the mass of the sample? Round your answer to three significant figures.
95.7
Describe how you could determine the specific heat of sample of a solid substance. You may assume that the substance does not react with water. In your answer, make sure to include a description of what equipment you would use and how you would interpret the data you collected.
I would use calorimetric to determine the specific heat and I would measure the mass of a sample
Sodium carbonate (Na2CO3) reacts with acetic acid (CH3COOH) to form sodium acetate (NaCH3COO), carbon dioxide (CO2), and water (H2O). A chemist carries out this reaction in a bomb calorimeter. The reaction causes the temperature of a bomb calorimeter to decrease by 0.985 K. The calorimeter has a mass of 1.500 kg and a specific heat of 2.52 J/g•K. What is the heat of reaction for this system?
-3.72
This Reaction is
endothermic
A sample of hexane (C6H14) has a mass of 0.580 g. The sample is burned in a bomb calorimeter that has a mass of 1.900 kg and a specific heat of 3.21 J/giK. What amount of heat is produced during the combustion of hexane if the temperature of the calorimeter increases by 4.542 K?
Not A
Which statement describes how a basic coffee cup calorimeter works?
It uses the mass and specific heat of water along with a thermometer to measure the gain or loss of energy when a substance is added.
Which statement defines calorimeter?
a device that measures the heat that is gained or lost in a chemical change
Which units express heat capacity?
J/°C, J/K, cal/°C, cal/K
What is the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°C to 70.0°C when 2,520 J of heat is applied?
0.00420 J/(gi°C)
A sample of an unknown substance has a mass of 0.465 kg. If 3,000.0 J of heat is required to heat the substance from 50.0°C to 100.0°C, what is the specific heat of the substance?
0.129 J/(gi°C)
Which statement defines the heat capacity of a sample?
the quantity of heat that is required to raise the sample's temperature by 1°C (or Kelvin)
A 75.00-g sample of an unknown metal is heated to 52.00°C. It is then placed in a coffee cup calorimeter filled with water. The calorimeter and the water inside have a combined mass of 225.0 g and an overall specific heat of 2.045 J/(gi°C). The initial temperature of the calorimeter is 7.50°C. If the system reaches a final temperature of 9.08°C when the metal is added, what is the specific heat of the unknown metal?
0.226 J/(gmc024-3.jpg°C)
A piece of iron (Cp = 0.450 J/(gi°C)) that has a mass of 21.5 g and an initial temperature of 100.0°C is submerged in X g of water (Cp = 4.184 J/(gi°C)) at 20.0°C. The temperature of the system (iron and water) changes to 21.4°C. What is the value of X?
Not A
When complete combustion of a 0.260-mol sample of a compound occurs in a bomb calorimeter, the temperature of the calorimeter increases from 20.0°C to 52.0°C. The mass of the calorimeter is 1.50 kg, and its specific heat is 3.410 J/(gi°C). What amount of heat would be produced by burning 1 mol of the compound?
D
Given:
The mass of the unknown substance, m = 0.465 kg = 465 gm
The amount of heat, q = 3000 J
The temperature change, ΔT = 100 - 50 = 50°C
To Find:
The specific heat of the unknown substance.
Calculation:
- We know that the heat in bringing a temperature change is given as:
q = mCΔT
⇒ C = q/mΔT
⇒ C = 3000/(465 × 50)
⇒ C = 3000/23250