Heat capacity and calorimetry
What is heat capacity?
Quantity of heat required to raise the temperature of unit mass of something by 1 degree
Bonus: How many people are absent in AP chem today compared to the first day of full attendance in AP chem this year?
well.... please count
I2(g)+3Cl(2)->2ICl3(s) deltaH=-214Kj/mol
I2(g)->I2(s) deltaH=-38
what is the value of the enthalpy change per mole of Icl3(s) formed?
-88 Kj
A+8B(element)->5C+6D
deltaH(kj/mol): A=-174 C=-394 D=-286
whats delta H for the whole thing
-3512
X2+Y2->2XY deltaHrxn=-200kj
what are the bond enthalpies?
X-X:450 y-y:250 x-y:450
might have more than 1 answer
A sample of peanut is combusted directly below a can containing 250g of water initially at 24.0c. The reaction releases 4.2kj of heat energy, all of which is transferred to the water.
whats the final temperature of water?
specific heat:4.2j/gc
28.0c
C3H8(g)+5O2(g)->3CO2(g)+4H2O(l)
deltaH=-2219KJ/mol
how much propane needs to be combusted to heat 750.0 g of water from 26.0 to 100.0 C？
specific heat: 4.18J/gC
4.61g
equation y = equation x+2xequationZ
deltaH: x=100 z=200
whats delta H for y
500
A->B+2C Hsoln=-189
deltaH: A=-524
B=-467
whats deltaH for c
-123
deltaH for bonds: A-B:370 A-A:440 B-B:190
2AB->A2+B2
what is deltaHrxn
110
Bonus: how long did michael play stardew valley in onr day?
16 hours and 1 min(error bound 2 hours)
(1/2)H2(g)+1/2Cl2->HCl deltaH=-92kj/mol
if 4.6x10^4 J of heat is produced,how many moles of Cl2 were consumed?
0.25
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CS2+3O2->CO2+2SO2
standard enthalpy change:x
standard entropy of formation :
y for CO2, z for SO2
what is STF for CS2(on terms of xyz)
Y+2Z-x
draw the decomposition of iodoenthane(can look up on internet or whatever)
bond enthalpies(DeltaH)
H-I:299 C-H:413 C-C:348 C=C:615 C-I:240
whats is deltaHrxn
87
A polystyrene cup initially contains 10.0g of water at a temperature T1. A 10.0g lead weight at a higher temperature T2 is added to the cup, and the mixture is allowed to reach thermal equilibrium.
When it reaches thermal equilibrium, which temperature above is it closer to?
water: 4.2j/gC
lead:0.13j/gC
T1
Explain what enthalpy is
Enthalpy is the measurement of energy in a thermodynamic system. The quantity of enthalpy equals to the total content of heat of a system, equivalent to the system’s internal energy plus the product of volume and pressure
(can accept anything reasonable)
How many schooldays do we have left
see calender
draw the overall enthalpy change
2NO+F2->2NOF
deltaH: NO:90 NOF: -70
decide as a class if it is right(i mean, we should be able to get it right together....)i cant upload images here
explain bond enthalpy
anything reasonable
A student adds 10.0g of KOH(s) to an insulated container holding 125.0g of water at 20.0C. After the KOH(s) has completely dissolved, the final temperature of the solution is 38.2C.
How much heat(inkj) was absorbed in the solution?
specific heat:4.18j/gC
10.3kj
Gift Question:
Give 2 equations that involves enthalpy
see ref sheet
What is Hess's law?(by definition)
heat absorbed or evolved (or the change in enthalpy) in any chemical reaction is a fixed quantity
Count them up i guess
what dance did HS theatre class do on arts fest?
新宝岛