Answer:
36.51%.
Explanation:
First find the percentage of iron in pure Fe2O3 using the atomic masses of the elements:
= (2 * 55.845) * 100 / (2*55.845+ 3*15.999)
= 69.94 %.
So the percentage of iron in the mixture
= 52.2 * 0.6994
= 36.51 (answer).
A) Selenium - is apart of Sulfur family
The answer is C
Beta decay occurs when a neutron changes into a proton while emitting an electron
The answer is 172.39950000000002
