please show all work and answer both questions 1. It requires an input of 7.94 k

Question

please show all work and answer both questions

1. It requires an input of 7.94 kJ to make the certain phase reaction proceed in the forward directio The system, held at constant expands in volume the reaction proceeds. This expansion performs 4.11 kJ work on the surroundings. The expansion can be assumed to be a completely efficient process Compute AE and AH for this process. 2. The AHo for the following reaction is 844 kJ 2 Pbs (s) 3 o2 (g) 2 Pbo (s) 2 SO2 (g) Compute the amount of heat liberated when 533 g of Pbo is formed.

Explanation / Answer

(1)

Since heat is given to the system, q = + 7.94 kJ

And work is done by the system, w = - 4.11 kJ

According to first law of thermodynamics,

deltaE = q + w = 7.94 - 4.11 = + 3.83 kJ

(2)

from the balanced eqution,

when 2 mol ( 2 * 223.2 g. ) of PbO is formed, amount of heat liberated = 844 kJ

then, 533 g. of PbO is formed , amount of heat liberated 533 * 844 / (2*223.2) = 1007.7 kJ

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