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The correct answer is 6.02 × 10^25.
To understand why, let's break it down:
1. Carlos calculated the number of molecules in 100 moles.
2. The result of his calculation on the calculator was 6.02E25.
Scientific notation is a way of representing very large or very small numbers in a concise format. In this case, the "E" denotes "times 10 raised to the power of".
So, 6.02E25 means 6.02 times 10 raised to the power of 25.
Hence, the number of molecules in 100 moles in scientific notation is 6.02 × 10^25.