Zinc metal reacts with hydrochloric acid (HCl) according to the equation:
Zn(s)+HCl(aq)=ZnCl2(aq)=H2(g)
How many grams of H2 are produced if 100 grams of zinc reacts?
1. You have the balanced equation.
2. Convert 100 g Zn to moles. moles = grams/molar mass.
3. Using the coefficients in the balanced equation, convert moles Zn to moles H2.
4. Now convert moles H2 to grams. g = moles x molar mass.
1105.2g
To determine the number of grams of H2 produced when 100 grams of zinc react, we first need to calculate the molar mass of zinc (Zn) and hydrogen gas (H2).
The molar mass of zinc (Zn) is 65.38 g/mol, and the molar mass of hydrogen gas (H2) is 2.02 g/mol. These values can be found on the periodic table.
Next, we calculate the number of moles of zinc that react using its molar mass:
Moles of Zn = Mass of Zn / Molar mass of Zn
Moles of Zn = 100 g / 65.38 g/mol ≈ 1.53 mol
According to the balanced equation, for every 1 mole of zinc that reacts, 1 mole of hydrogen gas is produced. Therefore, 1.53 moles of zinc will produce an equal number of moles of hydrogen gas.
Finally, we calculate the mass of hydrogen gas produced using its molar mass:
Mass of H2 = Moles of H2 × Molar mass of H2
Mass of H2 ≈ 1.53 mol × 2.02 g/mol ≈ 3.09 g
Therefore, approximately 3.09 grams of hydrogen gas will be produced when 100 grams of zinc reacts with hydrochloric acid.