A 24.5*g24.5⋅g mass of sulfuric acid is dissolved in enough water to make a solution of 100*mL100⋅mL volume. What is the concentration with respect to H_2SO_4H2SO4?

1 Answer
anor277
Oct 27, 2016

"Molarity"Molarity == "Moles of Solute"/"Volume of solution"Moles of SoluteVolume of solution

Explanation:

"Moles of sulfuric acid"Moles of sulfuric acid == (24.5*g)/(98.08*g*mol^-1)24.5⋅g98.08⋅g⋅mol−1

"Concentration of sulfuric acid"Concentration of sulfuric acid

== (24.5*g)/(98.08*g*mol^-1)xx1/(100*cm^3xx10^-3*L*cm^-3)24.5⋅g98.08⋅g⋅mol−1×1100⋅cm3×10−3⋅L⋅cm−3

== ??mol*L^-1??mol⋅L−1.

Note that this answer is dimensionally consistent. We require an answer with units of concentration, and we got one! This is why scientists place so much emphasis on units; it helps to get the calculations right.

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