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iVinArrow [24]
3 years ago
13

When oxygen reacts with hydrogen, it has the capacity to release 29 kilojoules of energy. Inside a fuel cell, oxygen reacts with

hydrogen to produce 23 kilojoules of useful energy. The rest of the energy is lost as heat. What’s the efficiency percentage of the fuel cell?
Chemistry
1 answer:
Vanyuwa [196]3 years ago
7 0

Answer:

79

Explanation:

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The pre-exponential constant and activation energy for the diffusion of iron in cobalt are 1.7 x 10-5 m2/s and 273,300 J/mol, re
Kitty [74]

<u>Answer:</u> The temperature of the system will be 1622 K

<u>Explanation:</u>

The equation relating the pre-exponential factor and activation energy follows:

\log D=\log D_o-\frac{E_a}{2.303RT}

where,

D = diffusion coefficient = 2.7\times 10^{-14}m^2/s

D_o = pre-exponential constant = 1.7\times 10^{-5}m^2/s

E_a = activation energy of iron in cobalt = 273,300 J/mol

R = Gas constant = 8.314 J/mol.K

T = temperature = ?

Putting values in above equation, we get:

\log (2.7\times 10^{-14})=\log (1.7\times 10^{-5})-\frac{273,300}{2.303\times 8.314\times T}\\\\T=1622K

Hence, the temperature of the system will be 1622 K

8 0
3 years ago
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PSYCHO15rus [73]

Answer:

g wind turbine

Explanation:

bc ik

8 0
3 years ago
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0.0487 mg + 0.05834 mg + 0.00327 mg
ivolga24 [154]
0.11031 mg
I think that is the answer
6 0
3 years ago
In the lab, you mix two solutions (each originally at the same temperature) and the temperature of the resulting solution decrea
Archy [21]

Answer:

The correct answer is option B.

Explanation:

Endothermic reactions are defined as the reactions in which energy of products is more than the energy of the reactants. In these reactions, energy is absorbed by the system.

The total enthalpy of the reaction (\Delta H) comes out to be positive.

Exothermic reactions are defined as the reactions in which energy of reactants is more than the energy of the products. In these reactions, energy is released by the system.

The total enthalpy of the reaction (\Delta H) comes out to be negative.

On mixing of both solution we had observed that temperature of the resulting solution was lowered this is because the energy was absorbed during the chemical reaction.

4 0
4 years ago
Is the following equation balanced correctly?<br><br> NaCl + H2 Na + 2HCl
slamgirl [31]
I think it’s you did this equation right!

They are equaled

NaCl + H2 Na + 2H Cl ✅

Good job
4 0
3 years ago
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