QUESTION 1 Which of the following will affect the amount of energy it takes to c

Question

QUESTION 1 Which of the following will affect the amount of energy it takes to change the temperature of a solid substance by 10 °C? the atmospheric pressure the initial temperature of the substance the specific heat capacity of the substance the amount (mass) of the substance you have QUESTION 2 A piece of metal A and a piece of metal B of the same mass and at the same temperature of 80°C are dropped into separate beakers each containing 100.0 g of water at room temperature. Once they equilibrate, you find that the beaker with the sample of metal A is warmer than the beaker with the sample of metal B. Which metal has the larger specific heat capacity? Metal A Metal B QUESTION 3 If the enthalpies of formation of carbon dioxide and water are -393.509 k/mol and -285.83 k/mol respectively, what is the enthalpy of formation of C10H8(s) in kJ/mol? C10H8(s) + 1 202(g) 1 0CO2(g) + 4H20 (I) o--51 56.1 kj

Explanation / Answer

a)

Patm -- > might be, if the change in pressure is very large then, it can be a factor

Ti --> false, since the latent heat is almost constant

Cp -->false, this is NOT sensibl eheat, but latent heat

mass -->correct, the more mass, the more heat you require

Q2

A + B

larger heat capacity --> has more "internal energy"

if A is warmer, this implies that the amount of heat of A is larger

since

Qlost = Qgain

QA = Qwater

then choose A

Q3

HRxn = Hproducts- HReactatns

HRxn = (10CO2 + 4H2O) - (C10H8 + 12O2

-5156.1 = (10*-393.509 + 4*-285.83) - (C10H8 + 12*0)

C10H8 = (10*-393.509 + 4*-285.83) + 5156.1

C10H8 = 77.69 kJ

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