SC6i - CALCULATIONS 2

Question 1

actual yield definition

Answer 1

amount of product actually made

Question 2

expected yield definition

Answer 2

amount of product expected to be made

Question 3

percentage yield formula

Answer 3

percentage yield = actual yield / expected yield x 100

Question 4

actual yield is always less than expected yield because (3 reasons)

Answer 4

1. some product is ‘left behind’ on the equipment eg. filter paper
2. the reaction may not be complete or may be reversible
3. there may be unwanted side reactions

Question 5

atom economy definition

Answer 5

a measure of how efficient or sustainable a chemical reaction is

Question 6

atom economy formula

Answer 6

atom economy (%) = mass of useful product / total mass of products x 100

Question 7

concentration definition

Answer 7

amount of solute (in g or moles) per dm3 or solvent

Question 8

concentration equation

Answer 8

concentration (g/dm3) = mass of solute (g) / volume of solution (dm3)
OR
concentration (mol/dm3) = moles of solute (mol) / volume of solution (dm3)

Question 9

moles equation including concentration and volume

Answer 9

moles (mol) = concentration (mol/dm3) x volume (dm3)

Question 10

equation for converting concentration in g/dm3 to mol/dm3

Answer 10

concentration in mol/dm3 = concentration in g/dm3 / RFM

Question 11

at room temperature and pressure (RTP), 1 mole of any gas occupies __dm3

Answer 11

24dm3

Question 12

mole equation for gases

Answer 12

moles = volume (dm3) / 24

moles = volume (dm3) / 24,000

Question 13

moles equation including mass and RFM

Answer 13

moles (mol) = mass (g) / RFM (g/mol)