Relative Mass

Question 1

What is relative atomic mass?

Answer 1

The relative atomic mass is the average mass of an atom of an element compared to 1/12 the mass of an atom of carbon-12.

Question 2

What is relative isotopic mass?

Answer 2

Relative isotopic mass is the mass of an atom of an isotope of an element compared to 1/12 that mass of an atom of carbon-12.

Question 3

How do you calculate the relative atomic mass?

Answer 3

Multiply each relative isotopic mass by its % relative isotopic abundance and add up the results.
Divide by 100.

Question 4

What is the relative molecular mass?

Answer 4

The average mass of a molecule compared to 1/12 the mass of an atom of carbon-12.

Question 5

How do you work out relative molecular mass?

Answer 5

Just add up the relative atomic mass values of all the atoms in the molecule.

Question 6

What is the relative formula mass?

Answer 6

The average mass of a formula unit compared to 1-12 the mass of an atom of carbon-12.

Question 7

How do you work out relative formula mass?

Answer 7

Add up the relative atomic masses of all the ions in the formula unit.

Question 8

What is used as the standard measurement of relative isotopic mass?

Answer 8

carbon-12