Mole and Formula
AKS Review: Moles
AKS Correlation
9c. Apply concepts of the mole and Avogadro’s number to conceptualize and calculate: -empirical/molecular formulas -mass, moles, and molecules relationships
In all calculations that follow, SHOW ALL WORK AND USE SIGNIFICANT FIGURES.
1. Write Avogadro’s number in standard and in scientific notation.
2. What is a mole?
3. (a) In your own words, what is molar mass?
(b) Find the molar mass of the following: Fe CCl4 Al2(CO3)3
4. Perform the following conversions. a) Determine the number of atoms in 3.75 mol Fe.
b) How many moles of CaCl2 contain 1.26x1024 formula units of CaCl2?
c) Determine the number of moles of arsenic in 1.90 g As.
d) Calculate the mass in grams of 42.5 mol of potassium cyanide (KCN).
e) Determine the mass in grams of 5.65 x 1024 atoms Se (hint: 2 steps)
5. What is the percent composition by mass of each element in: a) Water (H2O)
b) glucose (C6H12O6)
6. Define what an empirical formula is and give an example.
7. Define what a molecular formula is and give an example.
8. What is the difference between an empirical and a molecular formula?
9. A compound is 82.6 % C and 17.4 % H. a) What is the empirical formula for this compound?
b) Its molecular weight is 58.14 g/mol. What is the molecular formula for this compound?
AKS Review: Moles: ANSWER KEY
AKS Correlation
9c. Apply concepts of the mole and Avogadro’s number to conceptualize and calculate: -empirical/molecular formulas -mass, moles, and molecules relationships
In all calculations that follow, SHOW ALL WORK AND USE SIGNIFICANT FIGURES.
10. Write Avogadro’s number in standard and in scientific notation.
Avagadro’s number = 6.02 x
AKS Correlation
9c. Apply concepts of the mole and Avogadro’s number to conceptualize and calculate: -empirical/molecular formulas -mass, moles, and molecules relationships
In all calculations that follow, SHOW ALL WORK AND USE SIGNIFICANT FIGURES.
1. Write Avogadro’s number in standard and in scientific notation.
2. What is a mole?
3. (a) In your own words, what is molar mass?
(b) Find the molar mass of the following: Fe CCl4 Al2(CO3)3
4. Perform the following conversions. a) Determine the number of atoms in 3.75 mol Fe.
b) How many moles of CaCl2 contain 1.26x1024 formula units of CaCl2?
c) Determine the number of moles of arsenic in 1.90 g As.
d) Calculate the mass in grams of 42.5 mol of potassium cyanide (KCN).
e) Determine the mass in grams of 5.65 x 1024 atoms Se (hint: 2 steps)
5. What is the percent composition by mass of each element in: a) Water (H2O)
b) glucose (C6H12O6)
6. Define what an empirical formula is and give an example.
7. Define what a molecular formula is and give an example.
8. What is the difference between an empirical and a molecular formula?
9. A compound is 82.6 % C and 17.4 % H. a) What is the empirical formula for this compound?
b) Its molecular weight is 58.14 g/mol. What is the molecular formula for this compound?
AKS Review: Moles: ANSWER KEY
AKS Correlation
9c. Apply concepts of the mole and Avogadro’s number to conceptualize and calculate: -empirical/molecular formulas -mass, moles, and molecules relationships
In all calculations that follow, SHOW ALL WORK AND USE SIGNIFICANT FIGURES.
10. Write Avogadro’s number in standard and in scientific notation.
Avagadro’s number = 6.02 x