Download Problem Practice Chapter 3: Chemistry II AP

Review Chapter 3: Chemistry II AP
1. What is the formula for the hydrate of zinc sulfate using the data below.
.
Mass of crucible/lid
21.100 g
Mass of crucible/lid/hydrate
21.566 g
Mass of crucible/lid/anhydrous solid
21.422 g
2. Vitamin C contains the elements C, H, and O. It contains 40.9% C and 4.58% H by mass.
The molar mass is approximately 180 grams. The molecular formula for Vitamin C is _____.
3. The alkenes are compounds of carbon and hydrogen with the general formula CnH2n.
If 0.561 grams of any alkene are burned in excess oxygen, what number of moles of H2O
is formed?
CnH2n + O2  CO2 + H2O
a) .800 mole b).400 mole c).0800 mole d).0600 mole e).0400 mole
4. Sodium Hydrogen Carbonate, NaHCO3 is the active ingredient in baking soda. How
many grams of oxygen are in .350 grams of NaHCO3.
5. An element, “E”, is present 10E with a mass of 10.01 amu, and as 11E with a mass of
11.01 amu. The abundance of 10E is 19.78% and the abundance of 11E of 80.22% What
is the average atomic mass of E? What is the element?
6. A compound has the following percent composition. C = 49.67%, Cl = 48.92%, H =
1.39%. The molar mass is 289.9 g/mole. Determine the empirical and molecular formula
7. Calculate the mass percent of each element in C5H10O.
8. How many grams of carbon dioxide should form if a student heats 50.00 grams of
Aluminum carbonate and it decomposes?
___Al2(CO3)3 (s)  ___Al2O3 (s) + ___CO2(g)
a. Balance the equation.
b. Find the grams of CO2.
c. If the actgual lab value of CO2 is 25.0 grams, what is the %yield?
___Pb(NO3)2(aq) + ___NaOH(aq)  ___NaNO3 (aq) + ___Pb(OH)2(s)
9. A reaction combines 133.484 g of lead (II) nitrate with 45.010 g of sodium hydroxide.
a. Which reactant is limiting?
b. How much precipitate formed?