Stoichiometry

Question 0

RAM

Answer 0

Weighted average mass of the isotopes of the moment

Question 1

Isotopes

Answer 1

And atom with a different number of electrons

Question 2

Percentage composition

Answer 2

% composition =

(Mr of element/Mr of compound) x100

Question 3

Mr

Answer 3

Relative (formula/molecular) mass

Question 4

Ar

Answer 4

Relative atomic mass

Question 5

Avogadros constant

Answer 5

6.02 x 10^23

Question 6

Equation linking mass moles and Ar

Answer 6

Mol= mass/Ar

Question 7

Empirical formula

Answer 7

Expresses the smallest whole number ratio of the atoms present

Question 8

Molecular formula

Answer 8

Expresses the actual number of molecules in the compound

Question 9

How to get molecular formula from empirical formula

Answer 9

Find the amount of moles in the amounts given and then dived each by the smallest amount of moles- this gives you the ratio

Question 10

Molecular formula equation

Answer 10

MF = EF x RFM/EFM

Question 11

Percentage yield equation

Answer 11

(Actual amount of desired chemical obtained/theoretical amount formed) x 100

Theoretical amount- deduce moles then convert into mass

Question 12

Gases rule

Answer 12

All gases at the room temperature and pressure, one mile of any gas has a volume Of 24 litres

Question 13

1dm^3 in cm^3

Answer 13

1dm3 = 1000cm3

Question 14

Equation of moles and dm3

Answer 14

Number of moles= number of dm3 at RTP/24

Number of cm3 at RTP/24000