amount of substance

Question 1

Pv=nRT
units

Answer 1

P= pa
1kpa=100000pa
V=m^3
1000000cm^3=1m^3
n=mol
R=8.31
T= K
0C=273K

Question 2

% yeild

Answer 2

actual /theortical x100

Question 3

% atom economy equation

Answer 3

mass of desired/sum of all reactants x 100

Question 4

define mr

Answer 4

average mass of one molecule/ one twelfth mass of a C12 atom

Question 5

moles =

Answer 5

mass/mr

Question 6

concentration equation

Answer 6

mass/volume

Question 7

steps of a titration

Answer 7

fill a burette with the acid of know concentration
accurately measure out 25cm^3 of alkali standard solution using a pippete and transfer to conical flask

add a few drops of suitable indicator to alkali

slowly add acid from burette swirling constantly as soon as the inductor changes colour solution is neutral stop adding acid
record the volume of acid which is added

repeat process till you get concordant results

find the mean titre

Question 8

concordant meaning

Answer 8

within 0.1cm^3 of each other

Question 9

how to make a standard solution

Answer 9

weigh sample in weigh boat on balance
transfer to beaker and re weight boat
record the difference in mass

add distilled water
stir/swirl
until solid is dissolved

transfer to volumetric flask
with washings
make up to 250cm^3
shake