Please help.

Carbon-14 has a half-life of 5,730 years. A plant fossil was found to contain 1.75 grams of carbon-14. How long ago did the bone contain 7 grams of carbon-14?

THE BONE WAS 11, 460 YEARS WHEN IT CONTAIN 7 g OF CARBON-14

Explanation:

To calculate the age of a substance using isotopic dating, we use the equation below;

how old (time) = number of lives (n) * half life (t1/2)

n =the number of lives from 7g to 1.75 g

n = 7 > 3.5 > 1.75 = 2 lives

t1/2 = 5730 years.

How old was the fossil when it contains 7 g of carbon- 14 will be;

how old = n * t1/2

= 2 * 5730 years

= 11, 460 years.

The bone contains 7 grams of carbon-14 at 11, 460 years.

d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.