Equations

Question 1

What is the triangle formula involving moles?

Answer 1

Mass (g)
————————————
Moles(mol) | relative mass

Question 2

How do you calculate the mass of 1 mole from the mass of a single atom?

Answer 2

Avogadro’s constant (6.023 x 10*23) x mass of a single atom

Question 3

How do you do the empirical formula?

4

Answer 3

Take the mass of 2+ elements

Divide by relative atomic mass (Ar)

Divide all by the smallest number

Times results until you get while numbers or round to nearest whole number

Question 4

What is the ionic equation?

Answer 4

Cancelling out I needed elements (on both side of arrow)

Question 5

What is the chemical equation?

Answer 5

Make a balanced equation

Divide mass by moles

Make result equal across all spending on how many of each element there is

Do moles x rel mass to get mass

Question 6

How do you calculate % yield?

Answer 6

Actual amount / expected amount x100

Question 7

How do you calculate atom economy?

Answer 7

Mass of useful product/mass of all reactant x100

Question 8

How do you calculate relative atomic mass?

Answer 8

(% x mass no) + (% x mass no) / 100

Question 9

What is one mole in dm3?

Answer 9

24dm*3

Question 10

How do you calculate the volume of gas (S.T.P)?

Answer 10

Moles x 24dm*3

Question 11

What is Avogadro’s constant?

Answer 11

6.022 x 10*23

Question 12

What is the ideal gas equation?

And what is R?

Answer 12

PV = nRT

R = 8.31

Question 13

How do you convert °c to kelvin?

Answer 13

+ 273

Question 14

How do you calculate the mass of 1 ion (kg)?

Answer 14

Relative isotopic mass x 10-3
—————————
6.022 x 1023

Question 15

What is the equation involving concentration?

involved in titration

Answer 15

Moles (mol)
—————————
Concentration | volume
(Mol/dm3) | (dm3)

Question 16

Uncertainty - how do you calculate % error?

Answer 16

error/reading x100