The Mole

Question 1

How convert between no. of moles and no. of particles

Answer 1

number of moles
= no. of particles/ 6 x 10^23

Question 2

How calculate no.of moles using a element?

Answer 2

[mass of element in grams / [Mr of element in g/mol]]

Question 3

How calculate no.of moles of molecular substances or ionic compounds?

Answer 3

[mass of substance in grams]/[molar mass of substance in g/mol]

Question 4

How calculate percentage composition of compounds?

Answer 4

[number of atoms of element x Ar of element]/Mr of compound

Question 4

How calculate number of moles in gas?

Answer 4

[mass of gas in grams] / molar mass of gas in g/mol

Question 5

Another way to calculate no. of mole in gas

Answer 5

vol of gas in cm^3 / 24000cm^3

Question 6

Find conc of solution

Answer 6

mass of solute in g / vol of solution in dm3

Question 7

what is empirical formula

Answer 7

simplest ration of different types of atoms in the compound. e.g. instead of C2H8, we have CH4