Jeff has 10 grams of water and 10 grams of vegetable oil in separate containers. Both liquids have a temperature of 24°C. Jeff h
2 answers:
Answer: Vegetable oil has a lower heat capacity than water.
Explanation:
Specific heat capacity is the heat required to raise the temperature of 1 g of a substance through .
q = heat absorbed
m= mass of substance
c= specific heat
= change in temperature
As both vegetable oils and water both have same mass and have same initial temperature and absorbed same heat.
As the temperature of the oil increased more than the temperature of the water, it means the specific heat of oil is less than that of water as the heat absorbed is same.
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Explanation:
The reaction equation will be as follows.
Hence, moles of Na = moles of electron used
Therefore, calculate the number of moles of sodium as follows.
No. of moles =
= (as 1 kg = 1000 g)
= 195.65 mol
As, Q = where F = Faraday's constant
=
= mol C
Relation between electrical energy and Q is as follows.
E =
Hence, putting the given values into the above formula and then calculate the value of electricity as follows.
E =
=
=
As 1 J = kWh
Hence, kWh
= 3.39 kWh
Thus, we can conclude that 3.39 kilowatt-hours of electricity is required in the given situation.
Answer:
The equilibrium temperature of the system is 276.494 Kelvin.
Explanation:
Let consider the system formed by the sample of aluminium and water as a control mass, in which the sample is cooled and water is heated until thermal equilibrium is reached. The energy process is represented by First Law of Thermodynamics:
Where:
- Heat received by water, measured in joules.
- Heat released by the sample of aluminium, measured in joules.
Given that no mass is evaporated, the previous expression is expanded to:
Where:
,
- Mass of water and the sample of aluminium, measured in kilograms.
,
- Specific heats of the sample of aluminium and water, measured in joules per kilogram-Kelvin.
,
- Initial temperatures of the sample of aluminium and water, measured in Kelvin.
- Temperature which system reaches thermal equilibrium, measured in Kelvin.
The final temperature is now cleared:
Given that ,
,
,
,
and
, the final temperature of the system is:
The equilibrium temperature of the system is 276.494 Kelvin.