Moles Flashcards

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1
Q

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

A

The number of particles of a substance measured in moles

2
Q

What is 1 mole of a substance equal to

A

3
Q

What is the molar gas law

A

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

4
Q

What is rtp

A

25 degrees C / 298K

101 KPa

5
Q

What is standard temperature and pressure

A

0 degrees c/ 273 K

101 Pa

6
Q

At stp what does 1 mole of gas equal

A

22400 cm^3

22.4 dm^3 / litres

7
Q

How do you work out percentage composition

A

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

8
Q

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

A

Gases move randomly and are rigid spheres

There is no loss of energy when they collide

9
Q

1Kpa = ?Pa

A

1x10^3

10
Q

1 atm = ? Pa

A

101,325

11
Q

1 bar = ? KPa

A

100

12
Q

In pV=nRT what are the units

A
```P pressure (Pa)
V volume (m^3)
n moles (Mol)
R gas constant (8.3145 JK^-1mol^-1)
Temperature (K)```
13
Q

Why can’t the yield ever be 100%

A

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

14
Q

What is the atom economy

A

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

15
Q

What is the atom economy equation

A

Atom economy =

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