PROBLEM SESSION 2
The following set of problems covers material from chapter 2 and 3.
1. Identify each of the following elements:
91
a)
108
X
40
b)
X
47
2) Name each of the following compounds:
a) NH4Cl ______________
b) Fe2O3 ____________________
c) LiH __________________ d) KMnO4_________________
e) PCl5 _________________f) HNO2 _____________________
3) Write formulas for each of the following compounds:
a) potassium carbonate
d) hypoiodous acid
b) magnesium hydroxide
e) iron (III) chloride
c) dinitrogen tetroxide
f) ammonium acetate
4) Aspartame is an artificial sweetener that is 160 times sweeter than sucrose (table
sugar) when dissolved in water. It is marketed as Nutra-Sweet. The molecular formula
of aspartame is C14H18N2O5.
a.) Calculate the molar mass of aspartame.
b) How many moles of molecules are in 10.0 g of aspartame?
c) How many molecules are in 5.0 mg of aspartame?
d) How many atoms of nitrogen are in 1.2 g of aspartame?
e) What is the mass in grams of 1.0 x 109 molecules of aspartame?
5. A compound that assists in the coagulation of blood has the mass percentage
composition 76.71% C, 7.02% H, and 16.27% N. Determine the empirical formula of the
compound.