Thermodynamics is applied to learn a reaction\'s [A] feasibility. [B] mechanism.

Question

Thermodynamics is applied to learn a reaction's [A] feasibility. [B] mechanism. [C] rate. [D] stoichiometry. [E] pathway 2. Which of the following is (are) spontaneous process(cs)? 1. Ice melting at 25degreeC 2. Heat flowing from a hot object to a cold object 3. An iron tool rusting [A] 1 only [B] 2 only [C] 3 only [D] 1 and 3 only [E] 1, 2, and 3 3. A reaction must be spontaneous at all temperatures when [A] DeltaH is negative and DeltaS is positive. [B] DeltaH is positive and DeltaS is positive. [C] DeltaH is negative and DeltaS is negative. [D) DeltaH is positive and DeltaS is negative. [E] DeltaG is negative. 4. Which of the following would be expected to have the LARGEST entropy value per mole? [A] SO_3(g) [B] S_2(g) [C] SO_2(g) [D] S_g(g) [E] S(g) 5. Which symbol is used to represent the change of heat at constant pressure? [A] TDeltaS [B] DeltaH [C] DeltaG [D] DeltaU [E] DeltaS 6. Which of the following reactions has the largest positive value of DeltaS per mole of O_2? [A] 2C(s) + O_2(g) rightarrow 2CO(g) [B] 2H_2(g) + O_2(g) rightarrow 2H_2O(g) [C] C(s) + O_2(g) rightarrow CO_2(g) [D] 2NO(g) + O_2(g) rightarrow 2NO_2(g) [E] 2Mg(s) + O_2(g) rightarrow 2MgO(s)

Explanation / Answer

1) A

Thermodynamics applied to learn reaction's feasibility.

2) E

3) A

For spontaneous reaction,

change in enthalpy H = -ve

change in entropy S = +ve

5) B

Change of heat at constant pressure is called Enthalpy = H

6) E

2 mol of solid + 1 mole of gas --------> 2 moles of gas

It has laegest positive value of entropy.

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