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Mariana [72]
3 years ago
11

In a ceiling fan, N, electrical energy is converted to M, Kinetic energy. Some of the energy is "wasted" as heat. What is someth

ing you can do to minimize the energy dissipated as heat? A) turn off the light B) run the fan less than 4 hours/day C) only run the fan on low power setting D) make sure the motor and moving parts are lubricated to decrease friction
Chemistry
2 answers:
salantis [7]3 years ago
7 0

Answer:

It d

Explanation:

Kruka [31]3 years ago
6 0

Answer: It's D

Explanation:

I just did this question and i picked C but it's actually D

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Click the DeltaH is an Extensive Property button within the activity, and analyze the relationship between the two reactions tha
DaniilM [7]

Answer:

∴ΔH₂ = - 12,258 KJ

Explanation:

Enthalpy:

Enthalpy is a property of a thermodynamic system. Enthalpy of a system is equal to the sum of internal energy of the system and presser times volume of the system.

    The heat absorbes or releases in a closed system is the change of enthalpy of the system.

Given reactions are:

Reaction 1: C₃H₈(g)+5O₂(g)→ 3CO₂(g)+4H₂O,                 ΔH₁= - 2043 KJ

Reaction 2: 6C₃H₈(g)+30 O₂(g)→ 18 CO₂(g)+24 H₂O,     ΔH₂=?

Take a look at reaction 1 and reaction 2, the only difference is that 1 molecule of C₃H₈ is combusted in reaction 1 and 6 molecules of C₃H₈  is  combusted in reaction 2.

We can think the reaction 2 as occurring 6 different container and each containers contains 1 molecule of C₃H₈. The enthalpy is an extensive property. Total enthapy of the 6 containers is = 6×(-2043 KJ)

                                                                            = - 12,258 KJ

∴ΔH₂ = - 12,258 KJ

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