Download CHEM111 Exam 2: Solutions and Reactions and more Exams Chemistry in PDF only on Docsity!
You must show all work for credit
- (12 points) How many milliliters of a stock solution of 10.0 M HNO 3 would you have to use to prepare 0.350L of 0.400 M HNO 3?
- (12 points) Aluminum chloride is an inexpensive reagent used in many industrial processes. It is made by treating scrap aluminum with chlorine according to the following reaction: 2 Al(s) + 3 Cl 2 (g) → 2 AlCl 3 (s)
What mass of AlCl 3 can be produced from 2.70 g of Al and 4.05 g of Cl 2?
- (6 points) In the following reaction: Al(s) + 3 Ag +^ Al 3+^ + Ag(s)
(a) identify the species being oxidized
(b) identify the oxidizing agent
You must show all work for credit
- (12 points) Calculate the Hrxn for the following reaction: Fe 2 O 3 (s) + 3 CO(g) → 2 Fe(s) + 3 CO 2 (g) Given the following: 2 Fe(s) + 3/2 O 2 (g) → Fe2O 3 (s) H = -824.2 kJ
CO(g) + ½ O 2 (g) → CO 2 (g) H = -282.7 kJ
- (16 points) Write balanced net ionic equations for the reactions that occur when each of the following solutions are mixed. If no reaction occurs write no reaction.
(a) sodium nitrate + magnesium bromide
(b) sodium hydroxide + nickel(II) chloride
(c) KOH + HCl
(d) Na 2 CO 3 + MgCl (^2)
- (6 points) Write the chemical equation of the reaction for which the standard enthalpy change is equal to the standard enthalpy of formation for acetaminophen, C 8 H 9 O 2 N
You must show all work for credit
Potentially Helpful Information:
Substance Hf (kJ/mol)
H 2 S(g) -20. H 2 O(l) - H 2 O(g) - SO 2 (g) -296. SO 3 (g) -395.
Strong acids: HNO 3 , HCl, HBr, HI, H 2 SO 4 , HClO 4 and HClO 3
Solubility Rules :
- All lithium, sodium, potassium and ammonium salts are soluble.
- All salts containing nitrate and acetate are soluble.
- All salts containing chloride, bromide, and iodide are soluble except when also containing silver, lead(II) or mercury(I) ions.
- All salts containing sulfates are soluble except those which also contain lead(II), calcium, strontium, mercury(I) and barium.
- All hydroxides and metal oxides are insoluble except those of the group IA cations and those of calcium, strontium and barium.
- All phosphates, carbonates, sulfites and sulfides are insoluble except those of group IA cations or ammonium ion.
