What is the molar mass of Mg(ClO4)2?

223.21 g /mol

Explanation:

To find the molar mass (g/mol) of a substance, you have to add the amu's of all the elements together. First you have to determine how of element there are:

Mg=1, Cl=2, O=8.     Now you multiply the amu of each element by the number of elements in the compound. Then add them together. The amu of an element and its molar mass are the same.

1(24.31 g/mol) + 2(35.45 g/mol) + 8(16.00 g/mol) = 223.31 g/mol

i believe it is c.) 1575 j.

it's c (engineer's do their work with mechanical stuff not on any living being)