Exam Review 2018: The Mole (Multiple Choice)

1. What can be said said about 1 mol Ag and 1 mol Au?

a.	They are equal in mass.
b.	They contain the same number of atoms.
c.	Their molar masses are equal.
d.	They have the same atomic mass.

2. The formula that shows the simplest whole-number ratio of the atoms in a compound is the

a.	molecular formula.	c.	structural formula.
b.	ideal formula.	d.	empirical formula.

3. The molar mass of an element is the mass of one

a.	atom of the element.	c.	gram of the element.
b.	liter of the element.	d.	mole of the element.

4. What is the  molar mass of magnesium?

a.	12.00 g	c.	24.305 g
b.	26.982 g	d.	22.990 g

5. What is the empirical formula for a compound that is 36.1% Ca and 63.9% Cl?

a.	CaCl	c.	CaCl2
b.	Ca2Cl	d.	Ca2Cl2

6. What is the percentage of OH^– in Ca(OH)₂?

a.	45.9%	c.	75%
b.	66.6%	d.	90.1%

7. What is the mass of 5.55 moles of carbon monoxide?

                   

 a.  155 g

                   

  b. 143 g

                   

  c. 138 g

                   

  d. 122 g