Question

In pure water H+ mol/litre

Answer 1

10-7

The concentration of H+ is about 10-7 moles/liter. Answer: In that case the concentration of H+ ions in the solution is 10^-7 moles litre^-1 This is the conventional pH of water , whre there is equal concentrations of H+ and OH- ions (but in actual , pure water at normal temperature is slightly acidic !! :o) :D.

Answer 2

Well at first we examine the relationship density - volume. Assuming that the density of water is 0,9970479 g/ml at 25°C, one liter water has the mass of 997,0469 g or 0,9970479 kg. The molar mass of water is 18,01528 g/mol. So n = m/M. It follows that one liter water contains 997,0469/18,01528 mol or 55,3445 mol. Thus the molar concentration is ~ 55mol/L