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dimaraw [331]
3 years ago
11

Consider the reaction:C2H5OH(l) + 3O2(g) 2CO2(g) + 3H2O(l); DH = -1.37 x 103 kJConsider the following propositions:I. The reacti

on is endothermic.II. The reaction is exothermic.III. The enthalpy term would be different if the water formed wasgaseous.Which of these propositions is (are) true?A. IB. IIC. IIID. I, IIE. II, III
Chemistry
1 answer:
Semenov [28]3 years ago
7 0

Answer:

E. II, III

Explanation:

Let's consider the following reaction.

C₂H₅OH(l) + 3 O₂(g) ⇒ 2 CO₂(g) + 3 H₂O(l)

ΔH = -1.37 × 10³ kJ

<em>Consider the following propositions:</em>

<em>I. The reaction is endothermic.</em> FALSE. By convention, if the enthalpy of the reaction ΔH is negative, the reaction is exothermic.

<em>II. The reaction is exothermic.</em> TRUE.

<em>III. The enthalpy term would be different if the water formed was gaseous. </em>TRUE. The enthalpy of the reaction depends on the enthalpies of formation  (ΔHf) of reactants and products. ΔHf of H₂O(l) is different from ΔHf of H₂O(g).

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arlik [135]

You don't "turn" it into energy; petroleum HAS stored energy (chemical energy).However, you can turn it into ANOTHER TYPE OF ENERGY; usually this is done by burning the petroleum, and using it to drive machinery.

Since burning fuels is wasteful (the efficiency is limited, in theory, to the Carnot efficiency of a heat engine), other options are being explored, such as chemical reactions in a fuel cell. But such technology is not yet used on a large scale.

7 0
3 years ago
An electrode has a potential of 1.201 V with respect to a saturated silver-silver chloride electrode. What would the electrodes
fredd [130]

Answer:

The potential wrt. calomel is 1.254 V

Explanation:

Given:

Potential wrt. silver chloride E_{Ag}  = 1.201 V

Potential wrt. saturated silver chloride E = 0.197 V

Potential wrt. SCE E_{Hg} = 0.241 V

Now potential wrt. hydrogen is given by,

   = 1.201- 0.197

   = 1.004 V

And we find for potential wrt. calomel,

   = potential wrt. hydrogen + potential wrt. SEC

   = 1.004 +0.241

   = 1.254 V

Therefore, the potential wrt. calomel is 1.254 V

7 0
3 years ago
What is the pH of a 0.00530 M solution of HCI?
MrMuchimi

Answer:

2.28

Explanation:

HCl(l) ===> H+ + cl-

HCl is a very strong acid. Almost all of it will decompose to the right. That means the concentration of H+ is 0.00530

pH = - log [H+]

pH = - log[0.00530]

pH = - - 2.2757

pH = 2.2757

Rounded this 2.28

5 0
3 years ago
Sodium nitrate is used in fertilizers, explosives, and glass manufacturing. Give the formula for this compound
krek1111 [17]

Explanation:

The molecular formula for Sodium Nitrate is NaNO3. The SI base unit for amount of substance is the mole. 1 grams Sodium Nitrate is equal to 0.011765443644878 mole.

7 0
3 years ago
How many moles at of a gas will occupy 2.5 L at STP?
Eduardwww [97]

Answer/Explanation

am not sure but I think its

Standard temperature = 273K

2.50 LTemperature

5 0
3 years ago
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