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kvasek [131]
2 years ago
10

Which two elements make up the main structure of an organic compound?

Chemistry
2 answers:
muminat2 years ago
7 0

Answer:

b nitrogen&oxygen

Explanation:

i'm built different

marshall27 [118]2 years ago
7 0
It’s A because carbon and oxygen make unit to one element
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Which of the following expressions best represents a second order rate law?
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How much time would it take for 336 mg of copper to be plated at a current of 5.6 A ? Express your answer using two significant
schepotkina [342]

Answer:

1.8 × 10² s

Explanation:

Let's consider the reduction that occurs upon the electroplating of copper.

Cu²⁺(aq) + 2 e⁻ ⇒ Cu(s)

We will establish the following relationships:

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The time  that it would take for 336 mg of copper to be plated at a current of 5.6 A is:

336mgCu \times \frac{1gCu}{1,000mgCu} \times \frac{1molCu}{63.55gCu} \times \frac{2mole^{-} }{1molCu} \times \frac{94,486C}{1mole^{-}} \times \frac{1s}{5.6C} = 1.8 \times 10^{2} s

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