# What mass of sulfur is contained in a 250*g mass of 98% "sulfuric acid"?

Mar 7, 2017

Approx. $82 \cdot g$............

#### Explanation:

$\text{Moles of sulfuric acid}$ $=$ $\text{Mass"/"Molar mass}$

$= \frac{250 \cdot g}{98.08 \cdot g \cdot m o {l}^{-} 1} = 2.55 \cdot m o l$.

And thus there are $2.55 \cdot m o l \times 32.06 \cdot g \cdot m o {l}^{-} 1$ of sulfur, approx. $82 \cdot g$ sulfur.

Sulfuric acid can be obtained at 98% concentrations, but this is still an aqueous solution, with $\left[{H}_{2} S {O}_{4}\right] \cong 18 \cdot m o l \cdot {L}^{-} 1$.