Moles

Question 1

What is a better way of saying the amount of a substance

Answer 1

The number of particles of a substance measured in moles

Question 2

What is 1 mole of a substance equal to

Answer 2

Avogadros constant (6.92 x10^23) particles

Question 3

What is the molar gas law

Answer 3

1 mole of any gas occupies the same volume at the same temperature and pressure

Question 4

What is rtp

Answer 4

25 degrees C / 298K

101 KPa

Question 5

What is standard temperature and pressure

Answer 5

0 degrees c/ 273 K

101 Pa

Question 6

At stp what does 1 mole of gas equal

Answer 6

22400 cm^3

22.4 dm^3 / litres

Question 7

How do you work out percentage composition

Answer 7

Ar of substance
—————- X100
Mr of whole substance

Question 8

What assumptions do you have to make for the ideal gas law

Answer 8

Gases move randomly and are rigid spheres

There is no loss of energy when they collide

Question 9

1Kpa = ?Pa

Answer 9

1x10^3

Question 10

1 atm = ? Pa

Answer 10

101,325

Question 11

1 bar = ? KPa

Answer 11

100

Question 12

In pV=nRT what are the units

Answer 12

P pressure (Pa)
V volume (m^3)
n moles (Mol)
R gas constant (8.3145 JK^-1mol^-1)
Temperature (K)

Question 13

Why can’t the yield ever be 100%

Answer 13

Reaction not completed
Reversible reaction
Recrystallisation loses some of the product
Unexpected reaction

Question 14

What is the atom economy

Answer 14

The measure of how well atoms are used it uses 100% yield

Question 15

What is the atom economy equation

Answer 15

Atom economy =

Sum of Mr of all desired products
———————————- X100
Sum of mr of all products