1.2- Amount Of Substance

Question 0

Avogadro’s constant?

Answer 0

6.022*10^23

Question 1

Define the mole?

Answer 1

Amount of substance in grams that has the same number of particles as there are atoms in 12 grams of carbon-12

Question 2

Define relative atomic mass?

Answer 2

Average mass of one atom compared to one twelfth of the mass of one atom of carbon-12

Question 3

Relative molecular mass?

Answer 3

Average mass of a molecule compared to one twelfth of the mass of one atom of carbon-12

Question 4

Basic formula for moles?

Answer 4

Moles= mass/Mr

Question 5

Gas formula?

Answer 5

pV= nRT

P measured in Pa
V measured in m3
T measured in K
R = 8.31
n= moles

Question 6

Concentration formula?

Answer 6

Concentration= moles*1000/volume

Question 7

Volume conversions?

Answer 7

cm3 –> dm3/1000
cm3–> m3/1000000
dm3–> m3/1000

Question 8

Converting from °C to K?

Answer 8

°C –> K + 273

Question 9

Formula for percentage yield?

Answer 9

Percentage yield = actual yield*100/theoretical yield

Question 10

Formula for percentage atom economy?

Answer 10

% atom economy= mass of useful products*100/mass of all reactants

Question 11

Define empirical formula?

Answer 11

The simplest ratio of atoms of each element in a compound

Question 12

Define molecular formula?

Answer 12

The actual number of atoms of each element in the compound