Is my Chemistry teacher wrong or right?

My AP Chemistry gave us this exact problem to work out:
How many atoms are in 3.4 mol Zn?
After working this out, I got this answer:
2.0E24
It turned out wrong. After trial and error this turned out to be the correct answer:
2.05E24
Is my Chemistry teacher wrong in her rounding? Using significant rounding, I think the answer should be 2.0E24.

1 Answer
David G.
Oct 23, 2017

You're correct about the conventions of significant digits, although #2.05E24# would round to #2.1E24#, not #2.0E24#. When I did the calculation I got #2.0468E24#, which you are correct in rounding to #2.0E24#.

Explanation:

You win: but tell him/her humbly, because crowing is less likely to lead to good outcomes. ;-)

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