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Yanka [14]
3 years ago
11

8.1 moles of HCl is put into a beaker with enough water to make a total of 189.98 milliliters of

Chemistry
1 answer:
Kay [80]3 years ago
8 0

Answer:

42.64 M

Explanation:

Step 1: Given data

  • Moles of HCl (solute): 8.1 mol
  • Volume of the solution: 189.98 mL

Step 2: Convert the volume of the solution to liters

We will use the relationship 1 L = 1,000 mL.

189.98 mL \times \frac{1L}{1,000mL} = 0.18998L

Step 3: Calculate the molarity of the solution

The molarity is equal to the moles of solute divided by the liters of solution.

M= \frac{8.1mol}{0.18998L} = 42.64 M

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A reaction is exothermic if Δ<em>H</em> (or \Delta H _\text{rxn} in some textbooks) is negative:

  • H₂ + Br → 2 HBr, ΔH < 0.
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A reaction is endothermic if Δ<em>H</em> is positive:

  • 2 NH₃ → N₂ + 3 H₂, ΔH > 0.
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<h3>Explanation</h3>

The enthalpy of a system is the sum of its internal energy. ΔH < 0 indicates that the reactants lose internal energy in the reaction. Energy conserves, and those internal energies must have converted to some other form of energy. They typically end up as thermal energy. The reaction will release heat since it is exothermic.

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3 years ago
A solution of 20.0 g of which hydrated salt dissolved in
Dmitry_Shevchenko [17]

Answer:

(D) Na₂SO₄•10H₂O (M = 286).

Explanation:

  • The depression in freezing point of water by adding a solute is determined using the relation:

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Where, ΔTf is the depression in freezing point of water.

i is van't Hoff factor.

Kf is the molal depression constant.

m is the molality of the solute.

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(A) CuSO₄•5H₂O:

CuSO₄ is dissociated to Cu⁺² and SO₄²⁻.

So, i = dissociated ions/no. of particles = 2/1 = 2.

B) NiSO₄•6H₂O:

NiSO₄ is dissociated to Ni⁺² and SO₄²⁻.

So, i = dissociated ions/no. of particles = 2/1 = 2.

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So, i = dissociated ions/no. of particles = 2/1 = 2.

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So, i = dissociated ions/no. of particles = 3/1 = 3.

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So, the highest ΔTf resulted by adding Na₂SO₄•10H₂O salt.

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3 years ago
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Answer:

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