Potassium weighing 39 grams is dissolved with water, determine the volume of hydrogen released.

Potassium is an active alkali metal. Reacts violently with water even under normal conditions. In this case, as a result of the reaction, alkali is formed and hydrogen gas is released.

Conventionally, the reaction equation looks as follows:

2 K + 2 H2O = 2 KOH + H2

The molar mass of potassium is 39 g / mol

The molar volume of hydrogen is 22.4 l / mol

Using the equation, we make the proportion:

39 g of potassium corresponds to X l. hydrogen like

2 * 39 g / mol potassium corresponds to 22.4 l / mol hydrogen

X = (39 * 22.4) / (2 * 39) = 11.2 liters. hydrogen

Answer: the volume of hydrogen is 11.2 liters.