How many grams of HCI are there in 100.0 mL of concentrated HCl which is approximately 12.1M and 37% HCl by weight and the density of 1.191 g/mL?
1 Answer
Explanation:
The first thing to take note of here is that the problem provides you information you don't actually need.
The molarity of the solution is not important in determining how many grams of hydrochloric acid you have in that
So, you know that the solution has a density of
The mass of the sample you have here will thus be
100.0color(red)(cancel(color(black)("mL"))) * "1.191 g"/(1color(red)(cancel(color(black)("mL")))) = "119.1 g"
Now, you know that the solution has a
This means that your sample will contain
119.1color(red)(cancel(color(black)("g solution"))) * "37 g HCl"/(100color(red)(cancel(color(black)("g solution")))) = "44.067 g HCl"
Rounded to two sig figs, the number of sig figs you have for the percent concentration by mass, the answer will be
m_"HCl" = color(green)("44 g HCl")