# Calculations in Chemistry

How do you find the moles of a solid or pure liquid substance?
Mass (g) / Atomic mass
1 of 10
How do you find the moles in a solution (aq)?
Volume (cm^3) / 1000 * Concentration (mol dm^-3)
2 of 10
How do you find the moles in a gas?
Volume (cm^3) / 24000
3 of 10
How do you find the % yield?
mass of product made / total expect mass * 100
4 of 10
How do you find the atomic mass of an element with isotopes?
(% in atmosphere * atomic mass)+(% * mass) / 100
5 of 10
How do you find the energy transferred (J)?
mass (g) * 4.2 * change in temperature (celcius)
6 of 10
How do you find the enthalpy change (KJmol^-1)
Energy transferred / no. of moles
7 of 10
How do you find the bond enthalpy?
The bonds broken - the bonds made
8 of 10
How do you find the quantity of charge (coulombs) in electrolysis?
Current * time
9 of 10
How much charge (coulombs) is 1 mole of electrons in electrolysis?
96500 C => moles of elecrons = charge / 96500
10 of 10

## Other cards in this set

### Card 2

#### Front

How do you find the moles in a solution (aq)?

#### Back

Volume (cm^3) / 1000 * Concentration (mol dm^-3)

### Card 3

#### Front

How do you find the moles in a gas?

### Card 4

#### Front

How do you find the % yield?

### Card 5

#### Front

How do you find the atomic mass of an element with isotopes?