Please see the attached file for the fully formatted problem(s).

Problem 1:

> A piece of wood is 2ft x 2ft x 0.25 ft ----- the hot plate is also 2ft x 2ft square
> A wet piece of wood is placed on a steam heated hot plate ---- the dry weight of the wood is 10 lbs ----- the weight of the water in the wood is 6.5 lbs
> 450 psi saturated steam is used to heat the hot plate ---- the steam is approx. 456 degrees F and has an enthalpy of approx. 1202 btus/lb
> Given are Cp values for wood at .57 btus/lb/oF; water vapor at .46 btus/lb/oF; and water liquid at 1.00 btu's/lb/oF
> Assume no air flow over the wood
> If the steam flow to the hot plate is 25 lbs steam per minute and it is assumed that heat transfer from the hot plate to the wood is 100% efficient:

a) Determine the total energy need to heat the wood to completely bone dry?
b) Determine the time needed to completely dry the wood?
c) Determine how much condensate would be produced on the discharge end of the hot plate (assuming no other radiative or convective losses)
d) From a Physics stand point, would the total energy needed in this case be the amount of work performed?? If not, how would I calculate the work?

Steam inlet condensate out

Hot Plate

Problem 2:

> Exactly the same as above but:

- in this case the heat transfer from the hot plate to the wood is only 70% efficient

For the reaction CO+NO2--> CO2+NO
The activation energy for the forward reaction is 135kJ/mol of CO reacted from THIS information determine,
A) the heat of the reaction
B) what would happen to the reverse reaction

Hello, I'm having difficulty figuring out how to work out a rather simple physics problem and would appreciate some guidance. The problem is as follows:
A bottle containing 5.7kg of water at a temperature of 27.3 degrees Celsius is placed in a refrigerator kept at 2.9 degrees Celsius. How much heat is transferred from the wat

In a particular reaction, the system does work on the surroundings and absorbs heat rom the surroundings. What is the sign of the internal energy change, ^U?
A. always negative
B. always positive
C. positive or negative depending on the relative magnitudes of the energy transfers
D. always zero

A heat engine operates between two reservoirs at T_2= 600K and T_1= 350K. It takes in 1000J of energy from the higher-temperature reservoir and performed 250 J of work. Find the entropy change of the universe and the work that could have been done by an ideal Carnot engine operating between these two reservoirs.
I've tried

A piece of chromium metal with a mass of 24.26g is heated in boiling water to 98.3C and then dropped into a coffee-cup calorimeter containing 82.3g of water at 23.3C. When thermal equilibrium is reached, the final temperature is 25.6C. Calculate the specific heat capacity of chromium.
You determine that 187 J of heat is requi

Commercial cold-packs consist of solid ammonium nitrate and water. Ammonium nitrate absorbs 330 J of heat per gram dissolved in water. In a coffee-cup calorimeter, 2.00 g of ammonium nitrate are dissolved in 75.0 g of water at 30 degrees Celsius. Assuming that all of the heat is lost from the water, what is the final temperatu

10.1 g CaO is dropped into a styrofoam coffee cup containing 157 g H2O at 18.0 degrees C. If the following reaction occurs, then what temp will the water reach, assuming the cup is a perfect insulator and the cup absorbs only a negligible amount of heat?
CaO(s) + H2O(l) yields Ca(OH)2(s) delta H rxn= -64.8 kJ/mol

Describe the differences and similarities between temperature andheat. Analyze how heat transfer occurs during the processes of conduction and convection. Provide an example of where each occurs in natural physical systems

In moving out of a dormitory at the end of the semester, a student does 1.6 x 10^4 J of work. In the process, his internal energy decreases by 4.2 x 10^4 J. Determine each of the following quantities (including the algebraic sign): (a)W, (b) delta U, and (c)Q.