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zysi [14]
3 years ago
10

2C(s) + 2H2(g) → C2H4(g): ΔH = +52.4 kJ/mol Which statement about this reaction is correct?

Chemistry
1 answer:
artcher [175]3 years ago
6 0
<h3><u>Answer;</u></h3>

26.2 kJ of energy are absorbed for every mole of carbon reacted

<h3><u>Explanation;</u></h3>
  • ΔH is the enthalpy change which is given by subtracting the energy of reactants from the energy of products.
  • That is; ΔH = energy of products - energy of reactants
  • <u>In this case, it means that C2H4 has more energy than the the reactants. 52.4 J of energy to be precise, this energy is absorbed during the reaction.</u>
  • <u>However, Two moles of Carbon  require that much energy, thus one mole will require only 26.2 to react. </u>
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Answer:

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Explanation:

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3 years ago
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Suppose a 2.95 g of potassium iodide is dissolved in 350. mL of a 62.0 m M aqueous solution of silver nitrate. Calculate the fin
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Explanation :

First we have to calculate the moles of KI and AgNO_3.

\text{Moles of }KI=\frac{\text{Mass of }KI}{\text{Molar mass of }KI}

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and,

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As, 1 mole of KI react with 1 mole of AgNO_3

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From this we conclude that, AgNO_3 is an excess reagent because the given moles are greater than the required moles and KI is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of AgI

From the reaction, we conclude that

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\text{Concentration of }AgNO_3=\frac{0.0178mol}{0.350L}=0.0508M

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