Mole concept

Question 1

Ar (Relative atomic mass)

Answer 1

number of times the mass of one atom of an element is greater tahn 1/12 of the mass of one carbon-12 atom

Question 2

Mr (Relative molecular mass)

Answer 2

Mass of a molecule compound compared to 1/12 the mass of a carbon-12 atom

Question 3

Mr (relative formula mass)

Answer 3

Used for ionic compounds

Question 4

Percentage mass of X in compound XaYb

Answer 4

(AxAr)/Mr(XaYb) x 100%

Question 5

Mass of X in compound

Answer 5

(AxAr)/Mr(XaYb) x Mass of compound

Question 6

1 mole

Answer 6

6.02 x 10^23

Question 7

No. Of moles (solid/liquid)

Answer 7

Mass of substance/molar mass

Question 8

1kg

Answer 8

1000g

Question 9

1 tonne

Answer 9

10^6 g

Question 10

No. Of moles (gas)

Answer 10

Volume of gas/24dm^3 or 24000cm^3

Question 11

Empirical formula

Answer 11

Simplest mole ratio of no. Of atoms in one molecule

Question 12

Molecular formula

Answer 12

Actual number of atoms of the elements present in one molecule

Question 13

Stoichiometry

Answer 13

Relationship between amount of reactants and products formed in a chemical reaction