Potassium is a very flammable metal if it comes in to contact with water. As it burns with the water it creates potassium hydroxide (KOH) If you separate the potassium out from 50 grams of KOH, how many grams of potassium would you have?

$\text{Moles of potassium hydroxide}$ $=$ $\frac{50 \cdot g}{56.11 \cdot g \cdot m o {l}^{-} 1}$
$\text{Mass of potassium metal}$ $=$ $\frac{50 \cdot g}{56.11 \cdot g \cdot m o {l}^{-} 1} \times 39.10 \cdot g \cdot m o {l}^{-} 1$
$\cong$ ??g