Answer:
The age of the rock is 2.23x10⁹ years.
Explanation:
The age of the rock can be calculated using the following equation:
(1)
Where:
t: is the age of the rock =?
: is the half-life of ⁴⁰K = 1.248x10⁹ years
: is the quantity of ⁴⁰K in the sample = 281.8x10⁻⁹ mol
: is the quantity of ⁴⁰Ar in the sample = 7.25x10⁻⁹ mol
10.9%: is the percent of ⁴⁰Ar production by the decay of ⁴⁰K
By entering the above values into equation (1) we have:
Therefore, the age of the rock is 2.23x10⁹ years.
I hope it helps you!
Answer:
2.5 mole of O2
Explanation:
From the equation we see that we need 5 molecules of oxygen to react with 2 molecules of C2H2.
This means that 5 moles of oxygen molecules are needed to completely react with 2 moles of C2H2, because a mole is a unit of particle count.
From that we can infer that to react with 1 mole of C2H2 we need half of 5 moles of oxygen - so 2.5 mole of oxygen molecules.
2 is right am 70 percent sure
It is b have a great rest of your day