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3 years ago

Consider the reaction:

Chemistry

1 answer:

Vesna [10]3 years ago

7 0

Answer:

The correct answer is E.

Explanation:

Given the reaction:

C₂H₅OH (l) + 3 O₂(g) ⇒ 2 CO₂ (g) + 3 H₂O (l) ; ΔH = -1.37×10³ kJ

We can see that ΔH is negative. This means that the product formation energy is less than the reagent formation energy. In other words, the reaction releases heat and is therefore an exothermic reaction.

In addition, the enthalpy of formation of liquid water has different value than the enthalpy of formation of gaseous water. Therefore, the enthalpy variation would have a different value if the water formed was in a gaseous state.

Finally, the propositions II and III are true.

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At a certain temperature the vapor pressure of pure heptane (C_7 H_16) is measured to be 170. torr. Suppose a solution is prepar

steposvetlana [31]

Explanation:

The given data is as follows.

Pressure (P) = 170 torr, mass of heptane (m) = 86.7 g

First, we will calculate the number of moles as follows.

No. of moles = $\frac{mass}{\text{molar mass}}$

= $\frac{86.7 g}{100 g/mol}$

= 0.867 mol

Now, the number of moles of $CH_{3}COBr$ are calculated as follows.

No. of moles = $\frac{mass}{\text{molar mass}}$

= $\frac{125}{122.9}$

= 1.07

Therefore, mole fraction of heptane will be calculated as follows.

Mole fraction = $\frac{\text{moles of heptane}}{\text{total moles}}$

= $\frac{0.867}{0.867 + 1.07}$

= $\frac{0.867}{1.937}$

= 0.445

Now, we will calculate the partial pressure of heptane as follows.

$P_{A} = x_{A}P^{o}_{A}$

= $170 \times 0.445$

= 75.65 torr

Thus, we can conclude that the partial pressure of heptane vapor above this solution is 75.65 torr.

8 0

4 years ago

What is the oxidation state of each element in the compound CaS04? Include +or - in your answer as appropriate

borishaifa [10]

Answer:therefore the oxidation state of sulphur is +6 in the compound CaSO4.

Explanation:

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3 years ago

Which tool should Darla and Rob use to measure the force that pulls a car down the map

svetoff [14.1K]

Answer:

C. A Spring Scale

Explanation:

Using process of elimination, we can quickly decide that a stopwatch and a ruler will not be useful in measuring the force. This leaves us with either the spring scale or a balance scale. A balance scale is used to compare two weights, so this is eliminated. That leaves us with a spring scale. This is because we can attached the spring scale to the car and when we let it go, we can record the force. I hope this helps!

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2 years ago

Which factors can influence the length of time it takes for a half-life to occur?

vovikov84 [41]

Answer:

the radioactive half-life of an atom can depend on how it is bonded to other atoms. by changing the neighboring atoms that are bonded to a radioactive isotope, we can change its half-life.

Explanation:

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3 years ago

Identify the precipitate (if any) that forms when KOH and Cu(NO3)2 are mixed

Art [367]

Cu(OH)2 is the precipitate that forms

6 0

3 years ago