Moles And Calculations

Question 1

Number of moles

Answer 1

Mass / mr

Question 2

Number of particles / molecules

Answer 2

Number of moles x Avogadro’s number

Question 3

What is avagadros number

Answer 3

6.022 x 10^23

Question 4

Mass

Answer 4

Moles x mr

Question 5

Concentration (g/dm^3)

Answer 5

Mass (g) / volume (dm^3)

Question 6

Concentration (mol/dm^3)

Answer 6

Number of moles / volume (dm^3)

Question 7

How do you convert cm^3 to dm^3

Answer 7

Divide by 1000

Question 8

How do you convert concentration in g/dm^3 to mol/dm^3

Answer 8

Divide by the Mr

Question 9

Percentage yield

Answer 9

Actual mass / theoretical mass x 100

Question 10

Percentage atom economy

Answer 10

Mr of desired product / sum of Mr of reactants x 100

Question 11

Volume of gas (dm^3)

Answer 11

Number of moles of gas x 24dm^3

Question 12

Empirical formula

Answer 12

Find moles then find the mole ratio by dividing by the smallest mole

Question 13

Limiting reactant

Answer 13

Find out the moles of every element, sub into equation

Question 14

gas calculations no of moles

Answer 14

Volume of gas (dm^3) / 24

Question 15

Rate of reaction

Answer 15

Quantity of product made / time

Question 16

Number of atoms

Answer 16

Moles x avagadros number x number of atoms in the compound

Eg. H2O = x3
Eg. H2 = x2
Eg. C2H4 = x4