Lecture 4-Chemical equations, the mole & molarity

Question 1

1 mole of any element contains …..

Answer 1

the same number of atoms (Avogadro constant)

Question 2

What is Avogadro’s constant?

Answer 2

6.0221367 x 10^23

Question 3

How would you define avogadro’s number ?

Answer 3

The number of atoms found in 12g of carbon-12

Question 4

1 mole of any molecule contains ……..

Answer 4

Avogadro’s number of molecules

Question 5

The mass of 1 mole of any substance …..

Answer 5

the relative atomic mass / relative molecular mass expressed in g

Question 6

What is molar mass?

Answer 6

The mass of 1 mole of a substance (g/mol)

Question 7

N.o of moles=

Answer 7

mass/molar mass

Question 8

1 mole of any gas occupies the…..

Answer 8

same volume at standard temperature + pressure

Question 9

V= ?

Answer 9

22.4 L

Question 10

Molarity=

Answer 10

N.o of moles / volume in litres (mol/L)

Question 11

What is molarity?

Answer 11

Solution concentration expressed as moles of solute dissolved in 1 litre of solution

Question 12

1mL

Answer 12

1/1000 L = 0.001L

Question 13

1mg

Answer 13

1/1000 g = 0.001G