Question

Write down the concentration of each of the following solutions in g/L and mol/L.  4) 4.9 g H2SO4  in 200 mL solution

Answer 1

Given: Volume of solution = 200ml =0.2L, Mass of CH₃COOH in gram =4.9g

Molecular Formula = H₂SO₄

Molecular mass of H₂SO₄ = 2(H)+1(S)+4(O) = 2 × 1 + 32 + 4 ×16 = 98m

Mass of H₂SO₄ in Mole (mol)

= Mass of H₂SO₄ in gram(g)/ Molecular mass(m)= 4.9/98 = 0.05 mol

Concentration of H₂SO₄ (g/L)

=Mass of solute (g)/Volume(L)  = 4.9g/0.2L = 24.5 g/L

Concentration of H₂SO₄ (mol/L)

= Mass of H₂SO₄ (mol)/Volume of H₂SO₄ (L)

= 0.05mol/0.2L = 0.25 mol/L

Answer is 24.5 g/L & 0.25 mol/L