Which of the following equations is balanced?
a. na2so4(aq) + cacl2(aq) -> caso4(s) + nacl(aq)
b. na2so4(aq) + cacl2(aq) -> caso4(s) + 2nacl(aq)
c. 2na2so4(aq) + cacl2(aq) -> caso4(s) + 2nacl(aq)
d. na2so4(aq) + 2cacl2(aq) -> caso4(s) +nacl(aq)

answer is B

because both sides have equal numbers of atomos

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nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.