Equal masses of two non-reacting liquids are combined in a calorimeter. Liquid A

Question

Equal masses of two non-reacting liquids are combined in a calorimeter. Liquid A is initially at 100 degree C and liquid B is initially at 50 degree C. The final temperature is 80 degree C. Which statement is true? (A) The specific heat of liquid B is greater than that of liquid A. (B) The specific heat of liquid A is greater than that of liquid B. (C) The specific heat of liquid A is equal to the specific heat of liquid B. (D) Not enough information is given to draw a conclusion about the relative magnitudes of the specific heats of the two liquids. Calculate the standard enthalpy change for the reaction 2NO(g) + O_2(g) rightarrow 2NO_2(g). (A) -56 kJ (B) -112 kJ (C) +56 kJ (D) +112 kJ

Explanation / Answer

Q24

if they are the same amounts, then

QA = -QB

ma*Ca*dT = -mb*Cb*dT

dT is the same for both

mass is the same

Ca = -Cb

since ti is nearest to T = 100°C, then

A has a higher specific heat, since it will not change that easily

choose B

Q25.

HRxn = Hprod - Hreact

HRxn = 2*34 - (2*90 +0)

HRxn = -112 kJ

choose B

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