2. En una encuesta realizada a 150 personasacerca de su preferencia por las emisoras de radio se obtuvo la siguienteinformación:
- 52 escuchan radio Ritmo
-48 escuchan radio Miraflores
- 37 escuchan radio Moda
- 15 escuchan radio Ritmo y Miraflores
- 14 escuchan radio Moda y Miraflores
- 13 escuchan radio Ritmo y Moda
- 8 escuchan las tres radios mencionadas
Cuántas personas escuchan radio ritmo
Dero no radio moda?
a) 39 b) 40 c) 4i d) 42 ei 43​

The third chice: 0.0750 M Na₂SO₄

Explanation:

Assume 100% ionization:

1) 0.100 M solution K₂SO₄

K₂SO4 (aq) → 2K⁺ (aq) + SO₄²⁻ (aq)Mole ratios: 1 mol K₂SO4 : 2 mol K⁺  + 1 mol SO₄²⁻ (aq) : 3 mol ions. This is 1 : 3At constant volume, the mole ratios are equal to the concentration ratios (M).1  M K₂SO₄: 3 M ions = 0.100 M K₂SO₄ / x ⇒ x = 0.300 M ions

This means, that you have to find which of the choices is a solution that contains the same 0.300 M ion concentration.

2) 0.0800 M Na₂CO₃

Na₂CO₃ (aq) → 2 Na⁺ + CO₃⁻1 M Na₂CO₃ / 3 M ions = 0.0800M / x ⇒ x = 0.0267 M ions

This is not equal to 0.300 M, so this solution would not contain the same total concentration as a 0.100 M solution of K₂SO₄, and is not the right answer.

3)  0.100 M NaCl

NaCl → Na⁺ + Cl⁻1 M NaCl / 2 M ions = 0.100 M NaCl / x ⇒ x = 0.200 M ions

This is not equal to 0.300 M ion, so not a correct option.

4) 0.0750 M Na₃PO₄

Na₃PO₄ → 3Na⁺ + PO₄³⁻1 M Na₃PO₄ / 4 M ions = 0.0750 M Na₃PO₄ / x ⇒ x = 0.300 M ions

Hence, this ion concentration is equal to the ion concentration of a 0.100 M solution of K₂SO₄, and is the correct choice.

5)  0.0500 M NaOH

NaOH → Na⁺ + OH⁻1 M NaOH / 2 mol ions = 0.0500 M NaOH / x ⇒ x = 0.100 M ions

Not equal to 0.300 M, so wrong choice.