Answer:
Final temperature: 659.8ºC
Expansion work: 3*75=225 kJ
Internal energy change: 275 kJ
Explanation:
First, considering both initial and final states, write the energy balance:
Q is the only variable known. To determine the work, it is possible to consider the reversible process; the work done on a expansion reversible process may be calculated as:
The pressure is constant, so: 
(There is a multiplication by 100 due to the conversion of bar to kPa)
So, the internal energy change may be calculated from the energy balance (don't forget to multiply by the mass):
On the other hand, due to the low pressure the ideal gas law may be appropriate. The ideal gas law is written for both states:
Subtracting the first from the second:
Isolating 
:
Assuming that it is water steam, n=0.1666 kmol
ºC
Answer:
v = 16 m/s
Explanation:
Given that,
Distance, d = 400 m
Time taken, t = 25 s
We need to find the speed of the horse. Speed is equal to distance covered divided by time taken. So,
So, the speed of the horse is 16 m/s.
Explanation:
83.6-24.2= 59.4 which is the change in heat
Answer:
85.2 grams.
Explanation:
Look up the relative atomic mass data on a modern periodic table.
The Faraday's Constant 
gives the size of the charge (in Coulombs) on one mole of electrons. Also, keep in mind that 
.
Charge supplied to the iodine:
How many moles of electrons does that much charge correspond to?
.
Consider the reduction half-equation for iodine:
.
Divide both sides by 2 to make sure that the coefficient in front of 
is equal to 1.
.
The ratio between the coefficient in front of and that of 
is equal to 1. In other words, while gaseous iodine is in excess, each mole of electrons will produce one mole of iodine ions.
of electrons will produce of iodine ions.
The mass of one mole of iodine ions is approximately the same as that of one mole of iodine atoms.
.
.
