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Jobisdone [24]
3 years ago
15

If an oxygen isotope has 8 protons and 10 neutrons in its nucleus, what is its atomic mass?

Chemistry
2 answers:
larisa [96]3 years ago
5 0
I would probably say 18
Galina-37 [17]3 years ago
4 0
Atomic mass = number of protons + number of neutrons
= 10 + 8 = 18

In short, Your Answer would be Option C

Hope this helps!
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3 years ago
A reaction is second order respect to the reactant A. If the reaction is 85% complete in 12 minutes, how long would it take for
AnnZ [28]

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e. 22s

Explanation:

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Time = 12 minutes = 720 seconds

The integrated rate law for second order reactions is given as;

1 / [A] = (1 / [A]o) + kt

Making k subject of interest, we have;

kt = (1 / [A] ) - (1 / [A]o )

k = (1 / [A] ) - (1 / [A]o ) / t

k = [(1/ 15) - (1 / 100) ] / 720

k = (0.0667 - 0.01 ) / 720

k = 0.0567 / 720

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How long would it take for the reaction to be 15% complete?

Final concentration = 85 (Since the reaction would be 15% complete)

The integrated rate law for second order reactions is given as;

1 / [A] = (1 / [A]o) + kt

Making t subject of interest, we have;

kt = (1 / [A] ) - (1 / [A]o )

t = (1 / [A] ) - (1 / [A]o ) / k

t = [(1 / 85 ) - (1 / 100) ] / 7.875e^-5

t = (0.0117 - 0.01 ) / 7.875e^-5

t = 0.001765 / 7.875e^-5

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Corect option = E.

3 0
3 years ago
What is the charge of the ions formed by Na and by Cl?
Alexxandr [17]

Answer:

Na+ is positively charged as it loses an electron

Cl- is negatively charged as it gains an electron

3 0
3 years ago
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