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Lostsunrise [7]
3 years ago
15

A chemist needs 0.550 mol selenium for a reaction. What mass of selenium should a chemist use?

Chemistry
1 answer:
-BARSIC- [3]3 years ago
4 0

Answer:

The chemist would require to use 43.43 grams.

Explanation:

In order to solve this problem we need to know<u> how much do 0.550 moles of selenium weigh</u>. To do that we use selenium's<em> molar mass </em>and multiply it by the given number of moles:

  • 0.550 mol * 78.96 g/mol = 43.43 g

The chemist would require to use 43.43 grams.

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Answer is 355 grams.
Explanation:
Given the molecular weights:
M
r
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m
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a
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The analogy of the moles will be held constant:
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n
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a
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N
a
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n
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=
2
m
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M
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a
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m
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a
2
S
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4
M
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a
2
S
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4
=
2
200
40
x
142
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2
200
⋅
142
40
x
=
2
200
⋅
142
=
2
⋅
40
x
x
=
200
⋅
142
2
⋅
40
=
100
⋅
142
40
=
10
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142
4
=
1420
4
=
=
710
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s
(or just use a calculator)
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GenaCL600 [577]

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5 0
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Svetach [21]

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Explanation:

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I hope it will help you

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plz make me as a brainliest

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