# 128 grams of zinc dissolved in phosphoric acid find the volume of gas evolved.

September 12, 2021 | education

| The mass of zinc is equal to 128 g.

Let’s determine the volume of hydrogen that was formed as a result of the reaction.

First, you need to write down the reaction equations.

3Zn + 2H3PO4 = Zn3 (PO4) 2 + 3H2.

Determine the amount of zinc. We use the following formula to solve.

n = m / M.

Let’s calculate the molar mass.

M (Zn) = 65 g / mol.

n = 128/65 = 1.96 mol.

Further, according to the reaction equation, we determine the amount of hydrogen substance.

1.96 mol zinc – x mol hydrogen.

3 mol zinc – 3 mol hydrogen.

X = 3 * 1.96 / 3 = 1.96 mol.

Let’s determine the volume of hydrogen.

V = n * Vm = 1.96 * 22.4 = 44 liters.

Answer: the volume of hydrogen is 44 liters.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.