What is a mole ?

What is one mole of an element ?

What is the mole fraction of solute in 2.5m aqueous solution .

What is mole fraction of solute in 1.00 m solution:

A 5.2 molal aqueous solution of methyl alcohol CH_3OH is supplied. What is the mole fraction of methyl alcohol in the solution ?

If it is known that Fe_(0.96) O, Fe is present in +2 and +3 oxidation state, What is the mole fraction of Fe^(2+) in the compound ?

The concentration of solution of sulphuric acid is 18M and has density 1.84gcm^-3 . What is the mole fraction and weight percentage of H_2SO_4 in the solution?

A certain sample of cuprous sulphide is found to have composition Cu_(1.8)S, , because of imcroporation of Cu^(2+) ion in the lattice, What is the mole % of Cu^(2+) in total content in this crystal?

The density of a 56.0% by mass aqueous solution of 1-propanol (CH_3 CH_2 CH_2 OH) is 0.8975 g/cm^3 . What is the mole fraction of the 1-propanol ?

The partial pressure of nitrogen in air is 0.76 atm and its Henry's Law constant is 7.6 xx 10^4 atm at 300 K. What is the mole fraction of N_2 in the solution obtained when air is bubbled through water at 300 K.