Calculate the pressure of 0.76 moles of methane that occupies 2800 cm3 at a temperature of 290 K.
2 answers:
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Answer : q = 6020 J, w = -6020 J, Δe = 0
Solution : Given,
Molar heat of fusion of ice = 6020 J/mole
Number of moles = 1 mole
Pressure = 1 atm
Molar heat of fusion : It is defined as the amount of energy required to melt 1 mole of a substance at its melting point. There is no temperature change.
The relation between heat and molar heat of fusion is,
(in terms of mass)
or, (in terms of moles)
Now we have to calculate the value of q.
When temperature is constant then the system behaves isothermally and Δe is a temperature dependent variable.
So, the value of
Now we have to calculate the value of w.
Formula used :
where, q is heat required, w is work done and is internal energy.
Now put all the given values in above formula, we get
w = -6020 J
Therefore, q = 6020 J, w = -6020 J, Δe = 0
The density of human fat is . The mass of the pure fat is 11.1 lbs.
First convert mass from lb to g as follows:
1 lb=453.592 g
Thus,
Density of a substance is defined as mass per unit volume, thus volume can be calculated as:
Putting the values,
Therefore, volume gained by person will be .