How many atoms are in 355 mol Na?

2.138 x 10^26 atoms Na

Explanation:

atoms Na = 355 mol Na x (6.022 x 10^23 atoms Na/1 mol Na) = 2137.81 x 10^23 atoms Na = 2.138 x 10^26 atoms Na

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

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i think? ?