To find the total amount of chocolate Zack bought, we need to add the two amounts he purchased:
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Convert the quantities to the same format if necessary. The first amount is in ounces, and the second amount is also in ounces.
- Amount from the first store: 610.271 ounces
- Amount from the second store: 6.3 ounces
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Add the amounts together:
\( 610.271 + 6.3 \)
To add these conveniently, we can express 6.3 as 6.300 to match the decimal places:
\( 610.271 + 6.300 = 616.571 \)
Thus, the total amount of chocolate Zack bought is \( \boxed{616.571} \) ounces.