Have a dissolution of HNO3
in water. The density is 1.42g/mL
with a concentration of 16M
. What is the concentration in % mass/mass?
Alright. So the % mass/mass is expressed as
grams of HNO3grams of the dissolution⋅100
So I need to find the grams of HNO3
first. They tell me that the Molarity is
16=moles of HNO3liters of dissolution
HNO3
has a molar mass of 63
. So to find out how many moles of HNO3
are in the dissolution I need to divide the grams of HNO3
by 63
... But how am I supposed to find out the grams of HNO3
I was told that the numerator is 63
. But... 63
is the molar mass of HNO3
, not the number of moles of HNO3
in the dissolution.
Anyway, let's suppose that it is indeed 63
Therefore
16=63liters of dissolution⟹liters of dissolution=3.9
So there are 3.9
liters of dissolution? I'm not sure - I feel like I got this all wrong. How do you know there are 63
moles of HNO3