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Umnica [9.8K]
2 years ago
13

26 grams of CO2 to moles

Chemistry
1 answer:
neonofarm [45]2 years ago
4 0
First, find out how many grams are in one mole of CO2(the two oxygen atoms means you need to multiply oxygen’s amu by 2,then add whatever carbon’s amu is to that). Then divide 26 grams by that number and that will be your moles. There are only two significant figures, so round your answer correctly.
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A sample of sodium-24 with an activity of 14 mCi is used to study the rate of blood flow in the circulatory system. If sodium-24
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Answer:

See explanation

Explanation:

From;

0.693/t1/2 = 2.303/t log (Ao/A)

Where;

t1/2 = half life of the sodium-24

t = time taken

Ao = initial activity of sodium-24

A= activity of sodium-24 at time t

a)

0.693/15 = 2.303/15 log (14/A)

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0.0462/0.1535 =  log (14/A)

log (14/A) = 0.0462/0.1535

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14/A= 1.995

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A = 7.0 mCi

b)

0.693/15 = 2.303/30 log (14/A)

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0.0462/0.0768 =log (14/A)

(14/A) =Antilog (0.6)

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c)

0.693/15 = 2.303/45 log (14/A)

0.0462= 0.0512 log (14/A)

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d)

2.5 days = 2.5 * 24 hours = 60 hours

0.693/15 = 2.303/60 log (14/A)

0.0462 = 0.03838 log (14/A)

log (14/A) = 0.0462/0.03838

(14/A) = Antilog(1.2)

A= 14/Antilog(1.2)

A = 14/15.8

A = 0.886 mCi

Note that activity (A) decreases as time increases.

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Answer:

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