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romanna [79]
3 years ago
11

Reactant A contains 40 J of energy, and Reactant B contains 33.5 J of energy. The reactants combine to form product AB, which co

ntains 104 J of energy. What is the energy transformation?
a) Energy is absorbed because the product has more energy than the reactants have.
b) Energy is absorbed because the product the product has less energy than the reactants have.
c) Energy is lost because the product as more energy than the reactants have.
d) Energy is lost because the product has less energy than the reactants have.
Chemistry
1 answer:
Wittaler [7]3 years ago
8 0

Answer:

A

Explanation:

Energy is absorbed because the product has more energy than the reactants have.

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0.53g of acetanilide was subjected to kjeldahl determination and the ammonia produced was collected in 50cm3 of 0.50M of h2so4.o
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Answer:

10.57% of N in acetanilide

Explanation:

All nitrogen in the sample is converted in NH₃ in the Kjeldahl determination. The NH₃ reacts with H₂SO₄ as follows:

2NH₃ + H₂SO₄ → 2NH₄⁺ + SO₄²⁻

The acid in excess in titrated with Na₂CO₃ as follows:

Na₂CO₃ + H₂SO₄ → Na₂SO₄ + H₂O + CO₂

To solve this question we must find the moles of sodium carbonate = Moles of H₂SO₄ in excess. The added moles - Moles in excess = Moles of sulfuric acid that reacts:

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0.0250 moles - 0.0230 moles = 0.0020 moles H₂SO₄

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0.0020 moles H₂SO₄ * (2mol NH₃ / 1mol H₂SO₄) = 0.0040 moles NH₃ = Moles N

<em>mass N and mass percent:</em>

0.0040 moles N * (14g / mol) = 0.056gN / 0.53g * 100 =

<h3>10.57% of N in acetanilide</h3>
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