One day (24 hours), because one rotation of earth on its axis is the position of the countries to the sun shifting, thus resulting in the periods of sun and moon, (the day and the night).
To determine the concentration of [H+] ions in the solution, it is important that we know the dissociation reaction of the solute. For this case, it would be
HNO3 = H+ + NO3-
Therefore, there is 1:1 ratio between HNO3 and H+ ions. The concentration of the ions would be the same as the solute which is 1.0x10^-4 M.
The moles of ammonia in 1.20 x10^25 molecules of ammonia is calculated as follows
by use of Avogadro constant
1moles = 6.02 x10^23
what about 1.20 x10^25 moles
by use of cross multiplication
= 1 mole x ( 1.20 x10^25) /( 6.02 x10^23) = 19.93 moles
It is called a hypothesis
