The following reactions are carried out at atmospheric pressure (external) insid

Question

The following reactions are carried out at atmospheric pressure (external) inside the chamber of a piston. Will the piston plunger have moved out (expanded) or moved in (contracted) after the reaction has occurred and the system was allowed to return to its initial temperature of 110 degrees C?

1) N2(g) + 3H2(g)-->2NH3(g)

a)Piston has expanded
b)Piston has contracted
c)Piston is unchanged

2) C(s) + O2(g) --> CO2 (g)

a)Piston has expanded
b)Piston has contracted
c)Piston is unchanged

3) C2H5OH(g) + 3O2 --> 2 CO2(g) + 3 H2O(g)

a)Piston has expanded
b)Piston has contracted
c)Piston is unchanged

Explanation / Answer

Since the no of moles decreases for the 1st one in the forward direction, the system will contract

b)Piston has contracted

no change in the mole number so

c)Piston is unchanged

no. of moles increased so

a)Piston has expanded

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