# CHM110H5 Study Guide - Midterm Guide: Barium Sulfate, Liquid Oxygen, Redox

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10 Apr 2016
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Dec. 2011 Final Exam
2. a) Given an aqueous solution of Cr2(SO4)3 at 25˚C which is 1.26M and 1.37m, find the mole
fraction, the density and the % w/w.
Oct. 2014 Mid Term1
4. a. Using the half-reaction method, balance the following redox reaction which
occurs in aqueous acid. (Remember to use H3O+, not H+ in the balancing).
As2O3(s) + NO3-(aq)AsO43-(aq) + NO(g)
b. A person accidentally swallows a drop of liquid oxygen, O2(l), which has a density of
1.149 g/mL. Assuming that the drop of liquid has a volume of 0.050 mL, what volume of gas
will be produced in the person’s stomach at body temperature, 37 °C, and a pressure of 1 atm?
R=0.08205 L atm/K . mol Atomic mass of O =16.0 g/mol.
Chapter 3 Question 92
A salt contains only barium and one of the halide ions. A 0.158 g sample of the salt was
dissolved in water, and an excess of sulfuric acid was added to form barium sulfate (BaSO4),
which was filtered, dried, and weighed. Its mass was found to be 0.124 g. What is the formula of
the barium halide?
Chapter 3 Question 94
Consider the following unbalanced equation:
Ca3(PO4)2(s) + H2SO4(aq) → CaSO4(s) + H3PO4(aq)
What masses of calcium sulfate and phosphoric acid can be produced from the reaction of 1.0 kg
of calcium phosphate with 1.9 kg of concentrated sulfuric acid (98% H2SO4 by mass)?
A poisonous organic gas containing only C, O and Cl was found to have C (12.12%), Cl
(71.62%). The rate of diffusion of this gas was measured to be 19.2 mL/min. Under the same
conditions, the rate of diffusion of pure methane gas (CH4) is 47.8 mL/min. Find the Molecular
formula of the poisonous gas.
[At. Masses (g/mol): C=12.01, Cl=35.45, O=16.00]
Mid Term 1- Oct. 2014
3. A 6.537 g mixture of KI and NaI was dissolved in water and reacted with excess AgNO3. All of
the iodide precipitated as AgI. The mass of the AgI produced was 9.862 g. Calculate the % w/w
composition of the original mixture.
Atomic masses (g/mol): Na = 23.0, K=39.1, Ag=107.9, I=126.9
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## Document Summary

Dec. 2011 final exam: a) given an aqueous solution of cr2(so4)3 at 25 c which is 1. 26m and 1. 37m, find the mole fraction, the density and the % w/w. 4. occurs in aqueous acid. (remember to use h3o+, not h+ in the balancing). Using the half-reaction method, balance the following redox reaction which. A person accidentally swallows a drop of liquid oxygen, o2(l), which has a density of b. A salt contains only barium and one of the halide ions. A 0. 158 g sample of the salt was dissolved in water, and an excess of sulfuric acid was added to form barium sulfate (baso4), which was filtered, dried, and weighed. A poisonous organic gas containing only c, o and cl was found to have c (12. 12%), cl (71. 62%). The rate of diffusion of this gas was measured to be 19. 2 ml/min. Under the same conditions, the rate of diffusion of pure methane gas (ch4) is 47. 8 ml/min.