Actually your answer is correct. Your answer that you picked is correct because the basic SI unit for mass is a kilograms, so therefore your answer is 13kg which you picked.
Answer:
4.66 x 10^8 yr
Explanation:
The age of the rock can be calculated using the equation:
ln (N/N₀) = - kt where N is the quantiy of radioisotope decayed and N₀ is the initially quantity present of the radioisotope; k is the decay constant, and t is the time.
Now from the data , we have 78 argon-40 atoms for every 22 potassium-40 atoms, we can deduce that originally we had 22 + 78 = 100 atoms of potassium-40 so this is our N₀.
When we look at the equation, we see that k is unknown, but we can calculate it from the half-life which is given by the equation:
k = 0.693/ t half-life = 0.693/ 1.3 x 10⁹ yr = 5.33 x 10⁻¹⁰ yr⁻¹
Now we are in position to answer the question.
ln ( 78/100 ) = - (5.33 x 10⁻¹⁰ yr⁻¹ ) t
- 0.249 = - 5.33 x 10⁻¹⁰ yr⁻¹ t
0.249/ 5.33 x 10⁻¹⁰ yr⁻¹ = t
4.66 x 10^8 yr
Answer:
Ca2s that is answers and CuSO4is
Below are the choices and the answer is 1 and 4.
1. There are differences in molecular size and shape and thus in the strength of dispersion forces.
<span>2. There are differences in the molecular dipoles of the molecules. </span>
<span>3. There is increased hydrogen bonding with an increasing number of hydrogen atoms. </span>
<span>4. There are differences in bonding between atoms within the molecules. </span>
Answer:
D. Farmers wanted a political party that represented their interests.
Explanation:
got 100% on edge.
