Solutions : Henry Law [closed]

In below solution why the moles are considered half as their is nothing clearly specified in question. I mean it is not given that that mole fraction we get is for litre water.

• They just wrote the multiplication by liters in an unusual way. You are going from molarity to moles, which means multiplying by .5 L or 1/2 L. @user560199 – Tyberius Jun 5 '18 at 21:33