amount of substance

Question 1

what is the relative atomic mass of an element

Answer 1

average mass of an element divided by the mass of 1/12th of a carbon 12 atom

Question 2

what is Avogadro’s constant

Answer 2

6.022 x10 to the 23

Question 3

what is a mole

Answer 3

6.022 x10 to the 23 particles in a substance

Question 4

how to find moles

Answer 4

mass/mr

Question 5

how to find moles in a solution

Answer 5

concentration = moles/ volume
moles= conc x vol

Question 6

what is the ideal gas equation and it’s units

Answer 6

PV = nRT
P = pressure in pa
V = volume in meters cubed
n = moles
R = constant JK to the minus 1 mol to the munus 1
T= temperature in kelvin (-270 from celcius)

Question 7

what is an empirical formula

Answer 7

formula that represents the simplest whole number ratio of atoms of each element in a compound.

Question 8

how to find empirical formula

Answer 8

find the masses of each element in the compound
work out the number of moles of each element
convert the number of moles into a whole number ratio.

Question 9

atom economy equation

Answer 9

mass of desired / mass of reactants x100

Question 10

percentage yield equation

Answer 10

moles of product/ moles of theoretical product