3 years ago

Which radioactive isotope is commonly used to date wooden artifacts?

Chemistry

1 answer:

sergey [27]3 years ago

3 0

Carbon 14 because it has an approximate half life of 5000 years.

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Explanation:

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Số oxi hoá của nitơ trong NH3, H2SO4, NO3 lần lượt là:

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2 years ago

The acid-dissociation constant for benzoic acid (C6H5COOH) is 6.3×10−5. Calculate the equilibrium concentration of H3O+ in the s

raketka [301]

Answer : The equilibrium concentration of $H_3O^+$ in the solution is, $2.1\times 10^{-3}M$

Explanation :

The dissociation of acid reaction is:

$C_6H_5COOH+H_2O\rightarrow H_3O^++C_6H_5COO^-$

Initial conc. c 0 0

At eqm. c-x x x

Given:

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The expression of dissociation constant of acid is:

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Now put all the given values in this expression, we get:

$6.3\times 10^{-5}=\frac{(x)\times (x)}{[(7.0\times 10^{-2})-x]}$

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A solution of HCl has a concentration of 1.20 x 10-2 M. What is the pH of this solution?

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