stoichiometry

Question 1

what is meant by empirical formula?

Answer 1

simplest whole number ratio between the numbers of atoms of different molecules making up a compound

Question 2

what is an isotope?

Answer 2

a form of an element with the same number of protons, but different number of neutrons

Question 3

what is meant by ‘percentage composition’?

Answer 3

percent of the total mass of a given element in the compound

Question 4

how do you calculate empirical formula from percentage composition?

Answer 4

1) calculate the number of moles
2) divide by smallest number
3) multiply by a small number to obtain an integer ratio

Question 5

how do you calculate theoretical yield?

Answer 5

1) determine the number of moles of limiting reactant

2) use the stoichiometry of balanced equation

Question 6

what is the difference between theoretical yield and percentage yield?

Answer 6

theoretical yield refers to the amount of product that can be predicted from a balanced chemical equation

percentage yield refers to the product that can be produced and recovered in the lab

Question 7

how is the percentage yield calculated?

Answer 7

actual/theoretical x100