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Colt1911 [192]
3 years ago
9

If a reaction has a theoretical yield of 10.0 g and a student does the reaction and

Chemistry
2 answers:
lbvjy [14]3 years ago
6 0

Answer:

78.4%

Explanation:

yield = actual/theoretical = 7.84/10 = 78.4%

Reika [66]3 years ago
4 0
The correct answer is the correct answer is 74.8%
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The independent variable is the condition that you change in an experiment. It is the variable you control.

Explanation:

It is called independent because its value does not depend on and is not affected by the state of any other variable in the experiment. Sometimes you may hear this variable called the "controlled variable" because it is the one that is changed.

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3 years ago
The half life of 226/88 Ra is 1620 years. How much of a 12 g sample of 226/88 Ra will be left after 8 half lives?
Aloiza [94]

Answer:

0.0468 g.

Explanation:

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  • For a first-order reaction: k = ln2/(t1/2) = 0.693/(t1/2).

Where, k is the rate constant of the reaction.

t1/2 is the half-life time of the reaction (t1/2 = 1620 years).

∴ k = ln2/(t1/2) = 0.693/(1620 years) = 4.28 x 10⁻⁴ year⁻¹.

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t is the time of the reaction (t = t1/2 x 8 = 1620 years x 8 = 12960 year).

a is the initial concentration (a = 12.0 g).

(a-x) is the remaining concentration.

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(4.28 x 10⁻⁴ year⁻¹)(12960 year) = ln(12)/(a-x).

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256.34 = (12)/(a-x).

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8 0
3 years ago
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