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LenaWriter [7]
3 years ago
15

In 4.0 years , 40.0 kilograms of elemnt a decays to 5.0 kilograms

Chemistry
1 answer:
alexira [117]3 years ago
3 0
This problem is requiring us to find the half life of the element. We can solve this problem by using the equation as shown: A=Aoe^-(ln2/t)T where A is the final amount (5 kilogram), Ao is the initial amount (40.0 kilogram), t is the half-life (required) and lastly T time elapsed (4.0 years). Plug in the values in the equation and you should get 1.33 years as the half life. 

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cricket20 [7]

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<h3>What is the mass percent?</h3>

Mass percent is the mass of the element divided by the mass of the compound or solute.

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mCH₄O = 1 mC + 4 mH + 1 mO = 1 (12.01 amu) + 4 (1.00 amu) + 1 (16.00 amu) = 32.01 amu

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Learn more about mass percent here:brainly.com/question/4336659

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2 years ago
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So 1 mole

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standard pressure = 1 atm

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n = PV/RT

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elena55 [62]
I believe the answer is filtration.
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