Amount Of Substance

Question 1

How do you work out the empirical formula?

Answer 1

Divide each mass by the Mr

Divide each answer by the smallest value

Question 2

How to find the molecular formula?

Answer 2

Work out empirical formula
Add together the molar mass of the new compound
Times/divide to get it to the empirical mass

Question 3

How to work out the moles of a gas?

Answer 3

Volume/24 or 24000

Question 4

What is the definition of the molecular formula?

Answer 4

The molecular formula of a compound shoes the actual number of moles of each element present in one mole of the compound

Question 5

What is the definition of empirical formula?

Answer 5

The empirical formula of a compound is the simplest whole number ratio of the atoms present in a substance

Question 6

What is the formula for the ideal gas equation?

Answer 6

PV=nRT

Question 7

How do you calculate the moles in a solution?

Answer 7

Concentration X volume

Question 8

What is the equation for atom economy?

Answer 8

Mass of wanted product/total mass of products X 100

Question 9

How to find the moles of a substance?

Answer 9

Moles=mass/molar mass

Question 10

What is the definition of atom economy?

Answer 10

Measure of what proportion of the products of a reaction are the desired products and how much is waste

Question 11

What is the equation for percentage yield?

Answer 11

Mass of product obtained/maximum theoretical mass X 100