Final answer:
There are approximately 1.51 x 10^24 molecules in 2.5 moles of NaCl.
Step-by-step explanation:
The number of molecules in a given amount of a substance can be calculated using Avogadro's number, which is approximately 6.022 x 10^23 molecules per mole.
Given that there are 2.5 moles of NaCl, we can calculate the number of molecules using the equation:
Number of molecules = (2.5 mol) x (6.022 x 10^23 molecules/mol) = 1.51 x 10^24 molecules
Therefore, there are approximately 1.51 x 10^24 molecules in 2.5 moles of NaCl.
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