Stoichiometry

Question 1

What is a Mole?

Answer 1

the unit for an amount of a substance

Question 2

How do you work out the number of moles

Answer 2

Mass (g) / RFM

Question 3

How do you calculate the amount of product from a mass of reactant?

Answer 3

Write out balanced equation
Work out RFM of product and reactants
Calculate number of moles of reactant
Look at ratio in equation
Calculate mass of product

Question 4

What is empirical formula

Answer 4

way of writing a simple formular to show the number of whole atoms in a compound

Question 5

How do you calculate empirical formula

Answer 5

List the two elements
Write in the experimental masses
Find number of moles for each
Divide by smallest number of moles
Multiply to get whole numbers

Question 6

How do you convert experimental masses from percentages to whole numbers

Answer 6

Divide each one by their RFM

Question 7

What is molecular formula

Answer 7

actual number of atoms in a compound

Question 8

how to find molecular formula

Answer 8

Find mass of empirical formula
Divide by relative molecular mass to find number of empirical units in the molecule
Multiply the amount of elements in the compound by that number