Without doing any calculations, predict the sign of DS for each chemical reactio

Question

Without doing any calculations, predict the sign of DS for each chemical reaction.

2 KClO3 (s) 2 KCl (s) + 3 O2 (g)

HCl (g) + NH3 (g) NH4Cl (s)

Mg (s) + Cl2 (g) MgCl2 (s)

For the reaction below, determine the sign of DSsys and DSsurr. In addition predict under what temperature (all, high, or low temperatures), if any, will the reaction be spontaneous.

C3H8 (g) + 5 O2 (g) 3 CO2 (g) + 4 H2O (g)                        DH = -2044 kJ

Calculate DSsurr at the indicated temperature

< >H = -287 kJ, 298K

< >H = 127 kJ, 77 K

Explanation / Answer

1.

2 KClO3 (s) 2 KCl (s) + 3 O2 (g)

0 mol of gasess --> 3 mol of gases, chaos increases, so S must be positive

HCl (g) + NH3 (g) NH4Cl (s)

2 mol of gases --> 0 mol of gases, chaos decreases, so S must be negative

Mg (s) + Cl2 (g) MgCl2 (s)

1 mol of gas --> 0 mol of gas,  chaos decreases, so S must be negative

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