C4.1 Relative masses and moles

Question 1

What does the relative atomic mass show?

Answer 1

➢The mean abundance of the element’s isotopes

Question 2

What is the relative formula mass (Mr)?

Answer 2

➢ The addition of all the relative atomic masses of the elements

Question 3

What is 1 mole?

Answer 3

The relative atomic mass or relative formula mass of any substance expressed in grams

Question 4

What is Avogadro constant?

Answer 4

➢The mole of any substance which always contains the same number of atoms or molecules
➢ 6.02 x 10^23

Question 5

What is the equation for the number of moles?

Answer 5

Mass/Mr or Mass/Ar

Question 6

How are the masses of atoms compared?`

Answer 6

➢Measuring them to relative atomic mass of carbon-12

Question 7

How do you calculate the relative atomic mass?

Answer 7

➢If given the % abundance of it 2 isotopes

Question 8

What is the formula for calculating the relative atomic mass?

Answer 8

➢Ar of an element = ((Abundance x metal 1) + (Abundance x metal 2)) /100

Question 9

What is the relative atomic mass of Copper 63 which has an abundance of 69% and copper 65 which has an abundance of 31%?

Answer 9

➢(69x63) + (31x65) / 100 = 63.5