Amount Of Substance

Question 1

define the relative atomic mass of an element

Answer 1

Relative atomic mass is the average mass of one atom
compared to one twelfth of the mass of one atom of carbon-12

Question 2

state the equation for calculating the relative atomic mass (Ar) of an element

Answer 2

relative atomic mass = average mass of one atom of an element / 1/12th mass of one atom of carbon-12

Question 3

state the equation for calculating the relative molecular mass (Mr) of an element

Answer 3

relative molecular mass = average mass of one molecule / 1/12th mass of one atom of carbon-12

Question 4

how do you calculate the Mr (rfm) of a compound?

Answer 4

adding all the Ars of element

Question 5

what is the Mr of H2O?

Answer 5

(2 x 1.0) + 16 = 18.0