43) which the following reactions does not proceed significantly to the right in aqueous solutions?
a) Hsub3O^+ + OH^- --> 2Hsub2O
b) HCN + OH^- ---> Hsub2O + CN^-
c) Cu(Hsub2O)sub 4^2+ + 4 NHsub3 ---> Cu(NHsub3)sub4^2+ + 4Hsub2O
d) Hsub2SOsub4 + Hsub2O ---> Hsub3O^+ + HSOsub4^-
e) Hsub2O + HSOsub4^- ---> Hsub2SOsub4 + OH^-
44) A compound is heated to produce gas whose molecular mass is to be determined. The gas is collected by displacing water in a water filled flask inverted in a trough of water. which of the following is necessary to calculate the molecular mass of the gas, but does not need to be measured during the experiment
a) mass of the compound used in the experiment
b) temperature of the water in the trough
c) vapor pressure of the water
d) Barometric pressure
e) volume of water displaced from the flux
45) A 27 g sample of an unknown hydrocarbon was burned in excess oxygen to form 88.0 grams of carbon dioxide and 27 g of water. What is a possible molecular formula of the hydrocarbon.
Three multiple choice problems are reasoned through to find the most likely solution; one of which is a stoichiometry problem.