Calculations

Question 1

What is avogardo’s number?

Answer 1

6.022 *10^23

Question 2

Define relative atomic mass

Answer 2

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

Question 3

Define relative molecular mass?

Answer 3

The average mass of a molecule compared to the mass of one atom of carbon-12

Question 4

Moles, mass and Mr equation

Answer 4

Moles= mass/Mr

Question 5

Ideal gas equation

Answer 5

PV=nRT

Question 6

Concentration equation

Answer 6

C=moles/volume

Question 7

How to convert to K

Answer 7

Add 273

Question 8

Cm3 to dm3 is?

Answer 8

Divide by 1000

Question 9

From cm3 to m3?

Answer 9

Divide by 1000,000

Question 10

dm3 to m3 ?

Answer 10

Divide by 1000

Question 11

Number of particles formula?

Answer 11

Number of particles= moles x avogardo’s constant

Question 12

Molecular formula?

Answer 12

Actual number of atoms in a compound

Question 13

Percentage yield

Answer 13

Actual yield/theoretical yield *100

Question 14

Percentage atom economy?

Answer 14

Mass of useful products/ mass of all reactants *100

Question 15

Define a mole

Answer 15

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

Question 16

Formula for number of particles?

Answer 16

Number of particles= amount of substance (mols)* avogadro’s constant