December mocks - equations

Question 1

finding moles

Answer 1

mol = mass(g)/Mr
mol = volume(dm-3)/molar gas volume(dm-3)
molar gas volume is 24dm-3/24000cm-3
mol = conc(moldm-3)xvol(dm-3)

Question 2

percentage yield

Answer 2

actual yield/theoretical yield x 100%

Question 3

atom economy

Answer 3

useful product/total product x 100%

Question 4

ideal gas equation

Answer 4

pV=nRT
p = pressure (Pa)
V = volume (m-3)
n = amount of gas (moles)
R = ideal gas constant (on data sheet)
T = temperature (K)

Question 5

what are the conversions for the ideal gas equation

Answer 5

if pressure given in:
KPa x1000
atm x101,000
if temp given in:
degrees celcius +273
if volume given in:
dm-3 /1000
cm-3 /1,000,000

Question 6

percentage uncertainty

Answer 6

uncertainty/measured value x100%

Question 7

percentage change

Answer 7

(final -initial) / initial x 100%