Calculations stuff (TOPIC 9)

Question 1

Moles =

Answer 1

Mass / Mr or Ar

Question 2

Ar =

Answer 2

(Mass number of isotope x abundance) + ( Mass number of isotope x abundance) / 100

Question 3

1 mole =

Answer 3

6.02 x 10^23

Question 4

Molecular formula =

Answer 4

Mr / Empirical formula

Question 5

Percentage Yield =

Answer 5

Actual mass / theoretical mass x 100

Question 6

Moles of gas =

Answer 6

Gas volume / 24

Question 7

What is the molecular formula

Answer 7

The actual number of atoms of each element present in a molecule of a substance

Question 8

What is the empirical formula

Answer 8

The simplest whole number ration of atoms of each element in a compound

Question 9

What is theoretical yield?

Answer 9

The calculation you do to find the exact mass of a product

Question 10

What is actual yield?

Answer 10

The actual mass of a product you get as you never get 100%

Question 11

Gas Volume formula

Answer 11

Volume (dm ^3) = moles of gas x 24

Question 12

Concentration formula?

Answer 12

Concentration (dm^3) = Number of moles / volume of solution

Question 13

Unit for concentration?

Answer 13

Mol / dm^3