QUESTION 9 Which has the lowest entropy? CH3OH( s , –25°C) CH3OH( s , –15°C) CH3

Question

QUESTION 9

Which has the lowest entropy?

CH3OH(s, –25°C)

CH3OH(s, –15°C)

CH3OH(l, 15°C)

CH3OH(l, 25°C)

1 points (Extra Credit)   

QUESTION 10

Which statement is true about the formation of CaCO3(s) from CaO(s) and CO2(g) at 1.00 atm?

CaO(s) + CO2(g) CaCO3(s)          H° = -178.7 kJ and S° = -150.4 J/K

The reaction is spontaneous at all temperatures.

The reaction is spontaneous at high temperatures.

The reaction is spontaneous at low temperatures.

The reaction is not spontaneous at any temperature.

CH3OH(s, –25°C)

CH3OH(s, –15°C)

CH3OH(l, 15°C)

CH3OH(l, 25°C)

Explanation / Answer

9)

As temperature increases, vibration of molecules incvreases

So, the randomness increases at higher temperature

Also liquid has more entropy than solid

Answer: CH3OH(l, 25°C)

10)

when we use:

delta G = delta H - T*delta S

Since both delta H and delta S are negative, delta G will be negative at low temperature

So, reaction will be spontaneous at low temperature

Answer: The reaction is spontaneous at low temperatures.

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