Workshop CHE 166
Answers for
Problem Set #4
1.
a) B2S3 (s) + 6 H2O (l) ® 2 H3BO3 (aq) + 3 H2S (g)
b) 3 H2S (g) + 2 Fe(OH)3 (s) ® Fe2S3 (s) + 6 H2O (g)
c) 6 NH3 (g) + 2 Na (l) ® 2 NaN3 (s) + 9 H2 (g)
d) Cu (s) + 2 H2SO4 (aq) ® CuSO4 (aq) + SO2 (g) + 2 H2O (l)
e) 4 PH3 (g) + 8 O2 (g) ® 6 H2O (g) + P4O10 (s)
2.
a) dinitrogen pentaoxide, water, nitric acid // [1,1,2]
b) ammonium dichromate, nitrogen, chromium(III) oxide, water // [1,1,1,4]
c) phosphorous trichloride, water, phosphorous acid, hydrochloric acid // [1,3,1,3]
d) magnesium nitride, hydrochloric acid, magnesium chloride, ammonium chloride / [1,8,3,2]
e) benzene (organic cpd.), molecular oxygen, carbon dioxide, water // [2,15,12,6]
f) nitrogen trichloride, water, ammonia, hypochlorous acid // [1,3,1,3]
g) iron(III) hydroxide, sulfuric acid, iron(III) sulfate, water // [2,3,1,6]
h) sucrose, molecular oxygen, carbon dioxide, water // [1,6,6,11]
i) ammonia, molecular oxygen, nitrogen monoxide, water // [4,5,4,6]
j) lead(II) nitrate, lead(II) oxide, nitrogen dioxide, molecular oxygen // [2,2,4,1]
k) calcium phosphide, water, calcium hydroxide, phosphine // [1,6,3,2]
l) phosphorus trifluoride, xenon tetrafluoride, phosphorus pentafluoride, xenon // [2,1,2,1]
m) calcium carbide, water, calcium hydroxide, acetylene (organic cpd.) // [1,2,1,1]