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Nimfa-mama [501]
3 years ago
6

The isotope carbon-14 decays over time into nitrogen-14 with a half-life of 5,730 years. Suppose that you find a fossil that con

tains 1.25 grams of carbon-14 and 3.75 grams of nitrogen-14. How old is the fossil
Chemistry
1 answer:
KATRIN_1 [288]3 years ago
3 0

Answer:

11460 years

Explanation:

0.693/t1/2 = 2.303/t log (No/N)

t1/2 = half life of the carbon

t = age of the fossil

No= amount of radioactive material originally present

N= amount of radioactive material present at time=t

No= mass of carbon + nitrogen = 5g

0.693/5730 = 2.303/t log (5/1.25)

1.21 ×10^-4 = 1.3866/t

t= 1.3866/1.21 ×10^-4

t= 11460 years

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  We will balance the equation in the following order: metals, amethals, carbon, hydrogen and oxygen (the most common order).
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For the following reaction, the equilibrium constant Kc is 2.0 at a certain temperature. The reaction is endothermic. What do yo
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Answer:

The correct answer is : 'the concatenation of NO will increase'.

Explanation:

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If the temperature is increased, so according to the Le-Chatlier's principle , the equilibrium will shift in the direction where increase in temperature occurs.

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