Chemistry Revision

Question 1

Number of moles equation

Answer 1

mass of substance (g)
Number of moles = ———————————
Relative formula mass

Question 2

Number of particles equation

Answer 2

Number of particles = Number of moles x 6.02 x 10(to the power of 23)

Question 3

Percentage of an element in a compound equation

Answer 3

mass of element in compound
Percentage of an element in a compound equation = ———————————————- x100
relative formula mass of compound