The reaction ba(no3)2(aq) + na2so4(aq) → 2nano3(aq) + baso4(s) goes to completion because a

This reaction is completed by a double displacement

A double displacement occurs when two different salts are mixed in an aqueous state, since when they dissolve a salt their ions are dissociated and when mixed with another salt in an aqueous state they combine and form two new compounds

Double displacement reactions

the answer is   c.) 1575 j.

explanation:

it's c. elements are placed in rows based on how may valencies electrons have.