How many liters of a 0.5 m sodium hydroxide solution would contain 2 moles of solute?

Explanation:

1) Data:

a) M = 0.5 M

Note: since the question is about volume (liters) and moles of solute, the correct unit for the concentration of the hydroxide solution is M (upper case) which is the unit for molarity. Lower case m is used for molality, and you cannot calculate the volume of the solution unless you know some other data, e.g. density of the solution.

b) n = 2

c) V (in liters) = ?

2) Formula:

Molarity is the number of moles of solute per liter of solution:

3) Solution:

a) Clear V from the formula: V (in liters) = M / n

b) Substitute: V (in liters) =  2 moles /  0.5M  = 4 liters ← answer

sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell

- lead + phosphoric acid = hydrogen + lead(ii) phosphate