Question

une solution dacide sulfurique (h₂so₄) a une concentration de 49 g/1,2l. calculez la concentration en mol/l de cette solution. 2 points
a 1,28 mol/l
b 0,21 mol/l
c 0,84 mol/l
d 0,42 mol/l
e 0,63 mol/l

Explanation:

Step1: Calculate molar mass of \(H_2SO_4\)

Molar mass of \(H = 1\space g/mol\), \(S = 32\space g/mol\), \(O = 16\space g/mol\).
Molar mass \(M = 2\times1 + 32 + 4\times16 = 98\space g/mol\).

Step2: Find moles of \(H_2SO_4\)

Given mass \(m = 49\space g\), volume \(V = 1.2\space L\).
Moles \(n=\frac{m}{M}=\frac{49}{98}=0.5\space mol\).

Step3: Calculate molarity (\(mol/L\))

Molarity \(c=\frac{n}{V}=\frac{0.5}{1.2}\approx0.42\space mol/L\).

Answer:

D. 0,42 mol/L