Answer: 42.14 g
Explanation: calcium nitrate - 
, the molar mass of calcium nitrate = 164 g
<h3> formula used =

= no of moles </h3>
mass required =
=
g
Answer:
are there answer choices? chloroplasts are in plant cells, these give it a green color
Explanation:
The answer is Strontium(Sr). The reactive increase from right to left. And this element has two valence electrons. So Rb is not correct. Then the very reactive metal is Sr.
33.6 moles are needed to completely react with 84.0 moles of O2