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Andreyy89
3 years ago
8

A generator does work on an electric heater by forcing an electric current through it. Suppose 1 kJ of work is done on the heate

r and in turn 1 kJ of energy as heat is transferred to its surroundings. What is the change in internal energy of the heater?
Chemistry
2 answers:
alekssr [168]3 years ago
8 0

Answer:

-2 kJ.

Explanation:

Given:

∆Q = 1 kJ

W = 1 kJ

Using the first law of thermodynamics in application to conservation of energy,

∆U = ∆Q - W

Where,

∆U = change in internal energy

∆Q = heat supplied to the system

W = workdone by the system

∆U = -1 - 1

= -2 kJ.

azamat3 years ago
3 0

Answer:

The change in internal energy of the heater is 0 kJ

Explanation:

∆U = Q - W

Q is quantity of heat transferred = 1 kJ

W is work done on the heater = 1 kJ

Change in internal energy (∆U) = 1 - 1 = 0 kJ

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Answer is: <span>yield of a reaction is 56,4%.
</span>Chemical reaction: PCl₃ + 3H₂O → 3HCl + H₃PO₃.
m(PCl₃) = 200 g.
m(HCl) = 91,0 g.
n(PCl₃) = m(PCl₃) ÷ M(PCl₃).
n(PCl₃) = 200 g ÷ 137,33 g/mol.
n(PCl₃) = 1,46 mol.
n(HCl) = m(HCl) ÷ M(HCl).
n(HCl) = 91 g ÷ 36,45 g/mol.
n(HCl) = 2,47 mol.
From reaction: n(PCl₃) : n(HCl) = 1 : 3.
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Yield of reaction: 2,47 mol ÷ 4,38 mol · 100% = 56,4%.
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C) They are not made of matter.

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Comare and contrast physical property and chemical property
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One mole of carbon (12.0 g) in the form of crystalline graphite is burned at 25◦C and 1.000 atm pressure to form CO2(g). All of
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Answer:

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Explanation:

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