1.

in the given equation 4Fe(s)+3O_(2)(g) to 2Fe_(2)O_(3)(s) the entropy change is =-549.4 JK^(-1) mol^(-1)at 298 K (Delta_rH^(-)=-1648 xx10^(3)Jmol^(-1)).the above reactions is

Answer»

spontaneous
non-spontaneous
both (a) and (b)
none of these

Solution :At temperature, T entropy cahange of the surroundingsis
`DeltaS_(surr)=(Delta_(r)H^(THETA))/T ` ( atconstant pressure) `-(-1648xx10^(3)Jmol^(-1))/(298K) `
` 5530JK ^(-1) MOL^(-1)`
`Delta_(r)S("TOTAL")=5530+(-549.4)`
`4980.6 JK^(-1)mol^(-1)`
Hence , the abouve REACTION is spontaneous.


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