Mole Concept

Question 0

Given number of particles, find moles

Answer 0

Number of moles= number of particles/avogadro’s constant

Question 1

What is avogadro’s constant?

Answer 1

6x10^23

Question 2

Given mass of one substance, find number of moles

Answer 2

Number of moles=mass of one substance/molar mass(Mr)

Question 3

Given volume of gas, find number of moles

Answer 3

Number of moles= volume of gas(dm3)/molar volume at rtp, which is 24

Question 4

Convert cm3 to dm3

Answer 4

Divide by 1000

Question 5

Convert one litre to dm3

Answer 5

1 dm3= 1litre

Question 6

Convert ml to dm3

Answer 6

Divide by 1000

Question 7

Given number of moles and volume of solution, find molar concentration

Answer 7

Molar concentration= number of moles/volume of solution

Question 8

Given mass of solute, and volume of solution, find mass concentration

Answer 8

Mass concentration=mass of solution/volume of solution

Question 9

Given mass concentration, find molar concentration

Answer 9

Molar concentration=mass concentration/molar mass(Mr)

Question 10

Given mass of solute and volume of solution, find molar concentration.

Answer 10

1. Find mass concentration by:
   Mass of solute/volume of solution.
2. Find molar concentration:
   Mass concentration/molar mass

Question 11

What is empirical formular?

Answer 11

Simplest ratio of atoms of different elements present.

Question 12

How to derive at empirical formular?

Answer 12

1. Write out the mass given or percentage mass
2. Write their Ar below
3. Find the amount/mol.(mass/Ar)
4. divide by the smallest result from 3.
5. Find the ratio with smallest whole numbers