Calculate the mass and amount of potassium hydroxide (KOH) substance when interacting

Calculate the mass and amount of potassium hydroxide (KOH) substance when interacting with water 78 grams of potassium.

1. Let’s compose the equation of the chemical reaction:

2K + 2H2O = 2KOH + H2.

2. Find the chemical amount of reacted potassium:

n (K) = m (K) / M (K) = 78 g / 39 g / mol = 2 mol.

3. According to the reaction equation, we find the chemical amount and mass of the formed potassium hydroxide:

n (KOH) = n (K) = 2 mol.

m (KOH) = n (KOH) * M (KOH) = 2 mol * 56 g / mol = 112 g.

Answer: n (KOH) = 2 mol; m (KOH) = 112 g.