The first step in the industrial recovery of zinc from zinc sulfide ore is roasting. That is the conversion of ZnS to ZnO by heating: kJ 2ZnS(s) + 302(g) → 2ZnO(s) + 2 SO2 (g) AH=-879 mol Calculate the heat (in kJ) associated with roasting 3.00 grams of zinc sulfide. Be sure your answer has the correct number of significant digits. ☐ kJ x10

Given g(x, y, z)= e sin(-2x) cos(y), millimis memen VEM Ple Cre COMET The wor M Pa ex ma

3. Consider a solution containing dipolar molecules each having a positively charged head and a negatively charged tail. In the absence of an electric field the molecules point north (n), south (s), east (e), and west (w) with equal probabilities (distribution shown in Fig. 3a). A different probability distribution (shown in Fig. 3b), however, is found when a field is applied to the solution. P P 14 n e น S 7 16 14 16 n e W s Fig. 3a (field absent) Fig. 3b (field present) a) Determine the direction in which the field has its most positive pole (the polarity of the field). b) In the absence of the field, what is the entropy of the system? c) In the presence of the field, what is the entropy of the system? d) Does the application of the field cause the system to become more ordered or disordered?

Can you help me on questions 2 AND 3