For the following chemical reactions, predict the sign ofS for the system. (note

Question

For the following chemical reactions, predict the sign ofS for the system. (note that this should not require anydetailed calculations). a) Fe(s) + 2 HCl (l) --> FeCl2 (s) +H2 (g) b) 3 NO2 (g) + H2O(l) -->2HNO3 (l) + NO(g) c) 2K(s) + Cl2 (g) --> 2KCl(s) d) Cl2 (g) + 2NO(g) --> 2NOCl(g) e) SiCl4 (g) --> Si(s) +2Cl2(g) For the following chemical reactions, predict the sign ofS for the system. (note that this should not require anydetailed calculations). a) Fe(s) + 2 HCl (l) --> FeCl2 (s) +H2 (g) b) 3 NO2 (g) + H2O(l) -->2HNO3 (l) + NO(g) c) 2K(s) + Cl2 (g) --> 2KCl(s) d) Cl2 (g) + 2NO(g) --> 2NOCl(g) e) SiCl4 (g) --> Si(s) +2Cl2(g)

Explanation / Answer

b) negative c) negative d) negative e) positive
Two helpful rules:   S will bepositive if the substances ever become less dense(i.e from solid togas) and it will be negative if they are more dense(gas tosolid)



S will increase ifthe # of moles increases and it will decrease if the # of molesdecreases

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