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Murrr4er [49]
3 years ago
9

Ill give brainlists

Chemistry
1 answer:
Ronch [10]3 years ago
3 0

I think B would be the right answer, because knowing the feedback of results of the insecticide would give you more knowledge on which one would be less dangerous for animals and children.

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What is the name of the phase where stars live out most of their lives?
lisov135 [29]
The correct option is B. 
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1. Pro stars and pre-main sequence star
2. Main sequence  and giant star
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Which polymer is a biopolymer?
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Your grandfather is a farmer. You hear him complain about how his crops are not doing well. You know that we have the same amoun
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Chemical name for Fe2O3?
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Purification of chromium can be achieved by electrorefining chromium from an impure chromium anode onto a pure chromium cathode
miskamm [114]

Answer:

544.522 Hours

Explanation:

a) Mass = 12.5 kg = 12500 g

Now, Number of moles is given as

No of moles = Mass of Cr / Molar mass of Cr

=\frac{12500}{52}

= 240.38 moles

Cr^{3+}\Rightarrow 3 mols of electrons are required

\Rightarrow 240.38\times3 =721.14\text{mol of e-}

Converting moles of e- to coulombs of charge, (1 mol of electrons = 96500 C )

Q =721.14 mol×96500 C/mol

=69590010 of charge

We know that, Q = I×t

where Q is charge, I is current and t is time required.

\Rightarrow t =\frac{Q}{I}

=\frac{69590010}{35.5}

=196281.97 seconds

=\frac{1.96281\times10^5}{3600}

=544.522 Hours

3 0
3 years ago
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