why the entropy of a universe can not be negative?

why the entropy of a universe can not be negative?

An ideal gas (Cp/Cv = γ) is taken through a process in which the pressure and the volume vary as P = KVa. Find the value of a for which the specific heat capacity in the process is zero.

A 4m3/hr pump delivers water to a pressure tank. At the start, the gauge reads 138KPa until it reads 276KPa and then the pump was shut off. The volume of the tank is 180liters. At 276KPa the...

Hi there, I I have a question about Physics/ chemistry. If I have a bag of iron oxide(lll) and powdered aluminium in the ratio of 3:1 totalling 72g, with 54g being Fe2O3 and 18g of 2Al, what...

Estimate the isothermal compressibility of a dry gas for use at 4,200 psia using the following data taken at 120 oF. Pressure Z factor 6000 1.1252 5600 1.0736 5200 1...

A) Estimate the isothermal compressibility of a dry gas for use at 4,200 psia using the following data taken at 120 oF. B) Some of this gas is placed in a piston cylinder and pressurized...

What's that for the other properties that helps us to find the macroscopic properties?

Hey, I'm at my wit's end when it comes to thermodynamics. Apparently, I was given this little assignment from my lecturer to solve it at home. I need help in solving this, really...

A student takes a Styrofoam cooler in fills it with 2.00 L of water. He then adds a small amount of sodium to it and it reacts according to the equation below. The initial temperature of the water...

A student takes a Styrofoam cooler in fills it with 2.00 L of water. He then adds a small amount of sodium to it and it reacts according to the equation below. The initial temperature of the...

3. The enthalpy change for combustion of the methane is –56 kJ/g. Calculate, how much heat is released at combustion of 0.5 kg of the methane at constant pressure. (2 points) 4. The combustion...

A gas expands from 3 dm3 to 5 dm3 against a constant external pressure of 3atm. The work done during expansion is used to heat 10mol of water at 290 K. Calculate the final temperature of water...

A weightlifter holds a 150 kg weight 2 m from the floor. Calculate the speed which the weight hits the floor when dropped. You may assume that no energy leaves the system, and that the gravitational...

The options are (a) temperature (b) work (c) pressure (d) volume

In P-V graph of an ideal gas, there is a straight line with negative slope. How can we calculate the maximum temperature from the graph? Note:The graph is not a rectangular hyperbola but a...

Using heat formations , calculate the heat of vaporization for methyl alcohol, CH3OH, at 25 Celsius (answer:38 kj/mol) How many kJ's are required to caporize 28.6 g CH3OH at standard conditions...

When 25.0 mL of 1.0 M H2SO4 is added to 50.0mL of 1.0M of NaOH at 25.0 degrees C in a calorimeter, the temperature of the aqueous solution increases to 33.9 degrees C. Assuming that the specific heat...

If a person burns energy at the rate of 150 Watts, how much cool water (at 50o) is needed each hour to keep the person cool by evaporation (assume no heat is lost by conduction or radiation ? The...

I've spent all day on the following questions and can't seem to get them right. If anyone would be willing to provide a break down with the answer that would be greatly appreciated. I just want to...

How much more heat is needed to boil 5.0 kg of water than is needed to melt it? The latent heat of vaporization for water is 2260 kJ/kg, and the latent heat of fusion is 333 kJ/kg.