What mass of hydrogen gas is produced when 3.0 mol of iron react with excess hydrochloric acid according to the reaction below
2Fe + 6HCl --> 2FeCl3 + 3H2
To find the mass of hydrogen gas produced, we need to use the given mole ratio between iron and hydrogen gas.
From the balanced chemical equation:
2Fe + 6HCl → 2FeCl3 + 3H2
We can see that for every 2 moles of iron (Fe), 3 moles of hydrogen gas (H2) are produced.
Step 1: Calculate the number of moles of hydrogen gas:
Given Moles of iron (Fe) = 3.0 mol
Mole ratio: 2 Fe : 3 H2
So, the moles of hydrogen gas (H2) produced = (3.0 mol) x (3 mol H2 / 2 mol Fe)
= 4.5 mol H2
Step 2: Calculate the mass of hydrogen gas:
To calculate the mass, we need to know the molar mass of hydrogen gas (H2). The molar mass of hydrogen (H) is approximately 1 g/mol.
So, the molar mass of hydrogen gas (H2) = 2 g/mol.
Mass of hydrogen gas (H2) = (4.5 mol H2) x (2 g/mol)
= 9.0 g
Therefore, the mass of hydrogen gas produced when 3.0 mol of iron reacts with excess hydrochloric acid is 9.0 grams.