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liubo4ka [24]
3 years ago
6

Someone pls help ASAP! Thank u

Chemistry
1 answer:
DENIUS [597]3 years ago
4 0
I think it is a closed circuit
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Tick (√) the statements that are correct.
BARSIC [14]

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Hi GUYS PLEASE HELP ME YOU KNOW I HELP YOU WHEN YOU NEED IT MOST SO HERE IT GOES WHICH SEQUENCE REPRESENTS THE ORDER OF DEVELOPM
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Determine the molecular formula of a compound having the empirical formula C9H17O and a molar mass of 847.56g/mol.
Arlecino [84]
 The  molecular  formula of a compound  having  the empirical  formula  C9H17O  is calculated as below

(C9H17O)n =847.56

{(12 x9 + 1 x17 + 1 x16)}n= 847.56

147 n = 847.56
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h side by 147
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4 years ago
Charcoal from the dwelling level of the Lascaux Cave in France gives an average count of 0.97 disintegrations of ^14 C per minut
Verdich [7]

Answer:

Explanation:

count given by old sample = .97 disintegrations per minute per gram

count given by fresh sample = 6.68 disintegrations per minute per gram

Half life of radioactive carbon = 5568 years

rate of disintegration

dN / dt = λ N

In other words rate of disintegration is proportional to no of radioactive atoms present . As number reduces rate also reduces .

Let initial no of radioactive be N₀ and after time t , number reduces to N

N₀ / N = 6.68 / .97

Now

N=N_0e^{-\lambda t}

\frac{N}{N_0} =e^{-\lambda t}

\frac{6.68}{.97} = e^{\lambda t}

λ is disintegration constant

λ = .693 / half life

= .693 / 5568

= .00012446 year⁻¹

Putting the values in the equation above

\frac{6.68}{.97} = e^{.00012446\times t}

6.8866 = e^{.00012446\times t}

1.929577 = .00012446 t

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4 0
3 years ago
4. Substances that existed before mixing-still exist-after substances-are-mixed----
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