Amount of substance - Relative Masses

Question 1

What isotope is the international standard for comparing to?

Answer 1

C12

Question 2

What is atomic mass measured in?

Answer 2

Unified atomic mass unit (u)

Question 3

What is relative isotopic mass?

Answer 3

The mass of an atom of an isotope compared with 1/12th of the mass of an atom of carbon-12

Question 4

How do you figure out the relative isotope mass?

Answer 4

It’s the same as the mass number

Question 5

What is relative atomic mass?

Answer 5

The weighted mean mass of an atom of an element compared with 1/12th of the mass of an atom of carbon-12

Question 6

What can relative atomic mass be shortened to?

Answer 6

Ar

Question 7

How do you work out relative atomic mass?

Answer 7

((Isotopes % abundance x isotopes mass number)) + ((Isotopes % abundance x isotopes mass number))
————————————————————————————
100

Question 8

What is relative molecular mass shortened to?

Answer 8

Mr

Question 9

How to you work out relative molecular mass?

Answer 9

Mass number x 2

It’s for the diatomic ones (O2, N2)

Question 10

What is relative formula mass applied to?

Answer 10

Ionic compounds

Question 11

How do you work out relative formula mass?

Answer 11

Take the relative atomic mass of each element and add together