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I just started chemistry for health sciences and my question is, when adding weights i.e 320.084g...

I just started chemistry for health sciences and my question is, when adding weights i.e 320.084g + 20.0g + 22g do you write it as 362.084g or do you go to the nearest known significant figure which I would guess is 362?

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Answer #1

Addition or subtraction is rounded to the lowest number of decimal places.

320.084g has 3 decimal places

20.0g has 1 decimal place.

22g has no decimal place (I.e. zero) .

The addition result would also have least number of decimal places i.e. zero.

320.084 g + 20.0g + 22g = 362g. (Answer) ( correct significant figures)

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