Iam 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 39.89982753. 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 that would be

Round to 39.900.

Explanation:

You want to round to three decimal places.

39.899 827 53

That means you must drop all the underlined digits.

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

Then, rounding 39.899 827 53 to three decimal places gives 39.900.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

b is the correct answer

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