Consider the reaction 4 Fe(s) + 32(g) 2 Fe2O3(s), for which /--1648.4 kJ/mol and

Question

Consider the reaction 4 Fe(s) + 32(g) 2 Fe2O3(s), for which /--1648.4 kJ/mol and AS -549.5 J/mol K. Which of the following statements regarding the temperature dependence of the reaction is TRUE? This reaction is... A. not spontaneous at all temperatures C. not spontaneous at low temperatures and spontaneous at high temperatures D. spontaneous at all temperatures Consider the Gibb's Free Energy given by AG- AH - TAS. Indicate which the following statements is TRUE: A. The entropy of the system increases in all spontaneous reactions. B. All spontaneous reactions are exothermic. C. A reaction with a negative change in free energy (AG

Explanation / Answer

1)

delta Ho is negative

delta So is negative

use:

delta Go = delta Ho - T*delta So

Since both delta Ho and delta So are negative, delta Go will be negative at low temperature

for reaction to be spontaneous, delta Go will be negative

Answer: B

2)

delta Go = delta Ho - T*delta So

Since delta Ho is negative and delta So are positive, delta Go will be negative at all temperature

So, reaction will be spontaneous at all temperatures

Answer: D

3)

mass of water = mass of beaker and water - mass of beaker

= 29.62 g - 28.3220 g

= 1.298 g

But there should be only 2 digits after decimal

So,

mass of water = 1.30 g

Answer: B

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