For each chemical reaction listed in the first column of the table below, predic

Question

For each chemical reaction listed in the first column of the table below, predict the sign (positive or negative) of the reaction entropy Sm' If it's not possible to decide with the information given, check the "not enough information" button in the last column Note for advanced students: Assume the temperature remains constant. Assume all gases and solutions are ideal. alo reaction sign of reaction entropy 4Srn0 Ar O not enough information. N2(g) 3H2 (g) 2NH3 (g) O ASrn O not enough information. 2CH,OH (g) + 3O2(g) 2CO2(g) + 4H20(g) not enough information.

Explanation / Answer

entropy is degree of disorder. When a solid becomes a liquid, the degree of disorder increases. when a liquid becomes a gas also degree of disorder increases. Hence

in the reaction Ba(OH)2.8H2O+2NH4Cl(s) ----------->BaCl2(aq)+2NH3(aq)+10H2O(l) solid is dissolved and liquid products are formed. Hence entropy increases. deltaS>0

when ever there is an increase in no of moles of gases during the reaction, entropy change increases and whenever there is a decrease in no of moles of gaseous products, entroy change decreases.

in the reaction N2(g)+3H2(g)<---->2NH3(g), there are 4 mole of reactants and 2 mole of products. So entropy change is less since there is a decrease in no of moles. deltaS<0

in the reaction 2CH3OH(g)+3O2(g) --->2CO2(g)+ 4H2O(g), totlal moles of reactants= 2+3= 5 , total moles of products= 2+4=6, so there is an increase in no of moles. So entropy change increases for this reaction.

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