A gas stream containing 45wt% butane and 55wt% pentane is subjected to heating from 180K to 260K at constant pressure. calculate the required heat input per kg of this mixture?
neglecting changes in kinetic and potential energies.
neglecting changes in kinetic and potential energies.
1 Answer
The required heat input is 184 kJ/kg.
Explanation:
Assume that we have 1 kg of the mixture.
Then we have 450 g of butane and 550 g of pentane.
Step 1. Calculate the heat input for the butane
Butane is a liquid between 180 K and 260 K.
The formula for the quantity of heat
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where
In this problem,
The first task is to convert the mass of the butane to moles.
Now we can determine the quantity of heat needed.
Step 2. Calculate the heat input for the pentane
Pentane is a liquid between 180 K and 260 K.
Here,
We must convert the mass of the pentane to moles.
Now we can determine the quantity of heat needed.
Step 3. Calculate the total heat required