Calculate the amount of heat released when one bottle (250 g) of water is cooled from 30oC to 25oC. The specific heat of water i
1 answer:
Answer:
The amount of heat released is -5,232.5 J
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
The amount of heat received or transferred by a body when it undergoes a temperature variation (Δt) without there being a change of physical state (solid, liquid or gaseous) is calculated by the expression:
Q = c * m * ΔT
Where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case:
- Q=?
- c=4.186
- m= 250 g
- Δ=Tfinal - Tinitial= 25°C - 30°C= -5 °C
Replacing:
Q= 4.186 *250 g* (-5°C)
Solvng:
Q= -5,232.5 J
The amount of heat released is -5,232.5 J
You might be interested in
Answer:
%
Explanation:
The ethanol combustion reaction is:
→
If we had the amount (x moles) of ethanol, we would calculate the oxygen moles required:
Dividing the previous equation by x:
We would need 3.30 oxygen moles per ethanol mole.
Then we apply the composition relation between O2 and N2 in the feed air:
Then calculate the oxygen moles number leaving the reactor, considering that 0.85 ethanol moles react and the stoichiometry of the reaction:
Calculate the number of moles of CO2 and water considering the same:
The total number of moles at the reactor output would be:
So, the oxygen mole fraction would be:
%