Chapter 1.1 - Moles

Question 1

What is a mole?

Answer 1

A mole is a unit of measurement: 6.022x10^23 (avogados number)

Question 2

What is the difference between atoms and molecules?

Answer 2

An atom = no chemical bond
A molecule = more than one atom bonded together

Question 3

If you had one mole of H2O, How many molecules would you have?

Answer 3

6.022 x 1023 molecules of water

Question 4

If you had one mole of H2O, How many hydrogen atoms would there be?

Answer 4

2 x 6.022 x 1023 = 12.044 x 1023 = 1.204 x 1024 hydrogen atoms

Question 5

If you had one mole of H2O, How many oxygen atoms would there be?

Answer 5

1 x 6.022 x 1023 = 6.022 x 1023 oxygen atoms

Question 6

What is the difference between atomic and molar mass?

Answer 6

Atomic mass is the mass of one element, while molar mass is the mass in grams of a mole of atoms/element.

Question 7

What is the formula for molar mass?

Answer 7

MM= m/n
MM= Molar mass
M= Mass
N= number of moles

Question 8

Mass of one mole of carbon: 12.011g, if I have 2 moles of Carbon, how much does it weigh?

Answer 8

12

Question 9

Mass of one mole of carbon: 12.011g, if I have 12 grams of Carbon, how many moles do I have?

Answer 9

1

Question 10

Mass of one mole of carbon: 12.011g, if I have 36 grams of Carbon, how many moles do I have?

Answer 10

3

Question 11

Mass of one mole of carbon: 12.011g,if I have 6 grams of Carbon, how many moles do I have?

Answer 11

1/2

Question 12

What is the mass of 1 mole of glucose (C6H12O6)?

Mass of carbon: 12.011g

Mass of hydrogen: 1.008g

Mass of oxygen: 15.999g

Answer 12

Molar mass = 6 x (mass of carbon) + 12 x (mass of hydrogen) + 6 x
(mass of oxygen)

Molar mass = 6 (12.011) + 12 (1.008) + 6 (15.999)

Molar mass = 180.156 g/mol