How many moles of Ca are in 7.2x10^25 molecules of Ca
(show work)

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

We have the final answer as

Hope this helps you

the answer is c. nacl

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.