Chemistry
Mole Worksheet #3
Answer the following questions on a separate sheet of paper. Show all of your work.
Write the equation, write the numbers in the equation & put a box around your answer.
1. Copper, Cu
a. What is its molar mass?
b. How many moles are present in a sample of Cu that is 35.240 g ?
c. How many atoms of copper are present in 35.240 g?
d. How many grams of Cu are in a sample that contains 1.4 x1024 atoms Cu?
e. Analysis shows 3.25 x1023 atoms of copper. How many moles of Cu is
this?
2. Oxygen gas, O2
a. What is its molar mass?
b. How many moles are present in a sample of O2 that is 9.25 g ?
c. How many atoms of oxygen are present in 9.25 g?
d. How many grams of O2 are in a sample that contains 1.4 x1024 atoms O2?
e. Analysis shows 3.25 x1023 atoms of oxygen. How many moles of O2 is
this?
3. CaCO3
a. What is its molar mass?
b. How many moles are present in a sample of CaCO3 that is 5.00 g ?
How many grams of CaCO3 are in a sample that contains 9.4 x1022 molecules of CaCO3.
Mole Worksheet #4
Answer the following questions on a separate sheet of paper. Show all of your work.
Write the equation, write the numbers in the equation & put a box around your answer.
1. 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 for
aspartame is C14H18N2O5.
a)
b)
c)
d)
e)
f)
g)
Calculate the molar mass of aspartame.
How many moles of molecules are present in 10.0 g of aspartame?
Calculate the mass in grams of 1.56 mol aspartame.
How many molecules are in 5.0 mg aspartame?
How many atoms of nitrogen are in 1.2 g aspartame?
What is the mass in grams of 1.0 x 109 molecules of aspartame?
What is the mass in grams of one molecule of aspartame?
2. Dimethylnitrosamine, (CH3)2N2O is a carcinogenic (cancer causing) substance that
may be formed in foods, beverages or gastric juices from the reaction of nitrite ion (used
as a food preservative) with other substances.
a) What is the molar mass of dimethylnitrosamine?
b) How many moles of (CH3)2N2O molecules are present in 250 mg
dimethylnitrosamine?
c) What is the mass of 0.050 mole dimethylnitrosamine?
d) How many atoms of hydrogen are in 1.0 mole dimethylnitrosamine?
e) What is the mass of 1.0 x106 molecules of dimethylnitrosamine?
f) What is the mass in grams of one molecule of dimethylnitrosamine?