leftover notes

Question 1

percentage error

Answer 1

uncertainty/reading x100

Question 2

relative atomic mass

Answer 2

weighted mean mass of an atom of an element compared to 1/12th of the mass of an atom of carbon-12

Question 3

relative isotopic mass

Answer 3

mass of an atom of an isotope compared with 1/12th of the mass of an atom of carbon-12

Question 4

relative molecular mass

Answer 4

average mass of a molecule or forumula unit comapred to 1/12th of the mass of an atom of carbon-12

Question 5

moles

Answer 5

number of moles = number of particles/number of particles in a mole
number of moles = mass/Mr
number of moles = volume(dm3)/24dm3mol-1
number of moles = conc x dm3
percentage yield = actual yield/theoretical yield x 100
atom economy = mr desired product/sum of mr of all products x 100
pV = nRT
p = Pa
V = m3
n = number of moles
R = 8.314Jk-1mol-1
T = K