Enthalpy, Entropy, and Free Energy — Quiz

Question 1

Which process or processes produce an increase in entropy? i. cap n sub 2 times g plus 3 cap h sub 2 g rightarrow NH sub 3 times g ii. cap c sub 10 cap h sub 8 g rightarrow cap c sub 10 cap h sub 8 s iii. CH sub 3 OH l rightarrow CH sub 3 OH aq

Revolt · Accepted Answer

iii only

Question 2

The reaction proceeds spontaneously at 298 cap k NH sub 3 times g plus Cl sub 2 times g rightarrow NH sub 4 Cl s What is the sign of the entropy change, triangle cap s ?

Revolt · Accepted Answer

triangle cap s is negative because the product is less random than the reactants.

Question 3

What is triangle cap s for the reaction cap n sub 2 times g plus cap o sub 2 times g rightarrow 2 NO ? Use triangle cap g is equal to 173 point 3 kJ at 303 point 0 cap k and triangle cap h is equal to 180 point 7 kJ Use triangle cap g is equal to triangle cap h minus cap t triangle cap s

Revolt · Accepted Answer

24 point 4 2 cap j over cap k

Question 4

Which process involves a decrease in entropy?

Revolt · Accepted Answer

water freezing into ice

Question 5

Which process is spontaneous?

Revolt · Accepted Answer

spreading of a strong fragrance of perfume in a room

Enthalpy, Entropy, and Free Energy — Quiz Answers

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