Name:
Date:
Exam #2
(40 points)
Give a brief description or definition of the following terms. (1 point each)
Mole
Ion
Limiting Reagent
Empirical Formula
State the number of protons, neutrons, and electrons in each of the following atoms: (1 point
each)
18
O
57
Fe+2
127 -
I
Give me a couple of intelligent comments about the scientist you researched. (2 points)
750.0g of Pb(NO3)2 contains how many atoms of oxygen? (Think: How many moles? How
many molecules? How many atoms of oxygen?) (3 points)
Answer: ____________
The Haber Process – heating molecular hydrogen and molecular nitrogen to form ammonia gas,
NH3 – is represented by the following unbalanced equation:
H2
+
N2

NH3
If 5.5 g of nitrogen react with excess hydrogen, how many grams of ammonia would be
produced? (5 pts)
Answer: ____________
Consider the following unbalanced equation for the combustion of liquid butane:
C4H10 +
O2

H2O
+
CO2
A given butane lighter contains 10.45mL of liquid butane under pressure (density = 0.6g/mL).
How many grams of carbon dioxide would form from the complete combustion of this amount
of butane? (5 pts)
Answer: ____________
Just like in lab, hydrogen gas can be obtained from the reaction of magnesium metal with
hydrochloric acid:
Mg
+
HCl

MgCl2
+
H2
How much hydrogen gas is formed from the reaction of 6.00g of HCl with 5.00g magnesium?
Also, how much of the excess reagent is left over when reaction is complete? (8 points)
Answer: ____________
Succinic acid is composed of 40.68% carbon, 5.08% hydrogen, and 54.24% oxygen and has a
molar mass of 118.1 g/mol. In the presence of excess oxygen, succinic acid combusts to yield
water and carbon dioxide. How much carbon dioxide (in grams) would form from the complete
combustion of 35.0g succinic acid? (8 points)
Answer: ____________
Bonus: (1 point each)
To what speed must Doc Brown drive the DeLorean in order to make time travel possible?
“The evil that men do lives after them; the good is oft interred with their bones; so let it be with _______”
- Julius Caesar, 3.II