Calculate the volume of hydrogen obtained by the reaction of zinc with a 200 g sulfuric acid solution with a 15% acid fraction.

To solve this problem, we write down given: m (solution) = 200 g w = 15% or 0.15
Find: the volume of hydrogen.
Decision:
Let’s write down the formula for calculating the mass of a substance.
w = m (substance) / m (solution)
m (substance) = w * m (solution)
m (substance) = 0.15 * 200 = 30 g
Let’s write down the reaction equation.
Zn + H2SO4 = ZnSO4 + H2
Let’s calculate the molar mass of sulfuric acid.
M (H2SO4) = 1 * 2 + 32 + 16 * 4 = 98 g / mol
We write 30 g above sulfuric acid, and 98 g below sulfuric acid.
We write x l above hydrogen, and 22.4 l under hydrogen.
Let’s compose and solve the proportion.
x = 30 * 22.4 / 98 = 6.86 l
Answer: 6.86 L