Question

The weight percent of concentrated H2SO4, molar mass=980 g/mol, is 960% and its density is 184 g/ml. What is the molarity of concentrated H2SO4? 9.79 M 12.0 M 18.0M 532M 245 M avigator AN 20 Backspace HKLIL

Answer 1

C H2SO4 = 9.79 M

Step-by-step explanation:

• molarity (M) ≡ # dissolved species / V sln
• H2SO4 ↔ H3O+ + SO4-

∴ %w/w H2SO4 = 960% = g H2SO4 / g sln * 100

⇒ 9.6 = g H2SO4 / g sln

calculation base: 1000 g sln

⇒ g H2SO4 = 9600g

⇒ mol H2SO4 = 9600 g H2SO4 * ( mol H2SO4/ 980g H2SO4 ) = 9.796 mol H2SO4

⇒ V sln = 1000g sln / 1000g/L = 1 L sln

∴ ρ H20 ≅ 1000 Kg/m³ = 1000 g/L

⇒ C H2SO4 = 9.796 mol H2SO4 / 1 L sln

⇒ C H2SO4 = 9.796 M