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Aneli [31]
3 years ago
11

I am doing a average atomic mass question. I have the answer to it, but it says to round it to 3 decimal places. The answer is 3

9.89982753. I don't know whether to round it to just the 39.899 or to actually round it to it being 39.900. if anyone could help that would be great!!!!
Chemistry
2 answers:
vichka [17]3 years ago
8 0
You have to round to 39.900. Leaving it as 39.899 would be an inaccurate representation of the molecule’s approximate value, especially for average atomic mass.
White raven [17]3 years ago
8 0

Answer:

Round to 39.900.

Explanation:

You want to round to three decimal places.

39.899 <u>827 53</u>

That means you must drop all the underlined digits.

The rule for rounding is: <em>If the first figure dropped (8) is</em> <em>greater than 5, increase the last figure kept (9) by 1</em>.

Then, rounding 39.899 <u>827 53</u> to three decimal places gives 39.900.

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