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April 17, 2014

Homework Help: Chemistry

Posted by Pablo on Thursday, January 10, 2013 at 11:29pm.

I have a Chemistry question which should be very simple but I do not know what significant figures are.

Assuming the following numbers are measurements and using the rules for significant figures, determine the answer for the following calculation.

(15.5/42)*219.5=

1. 81.0059
2. 81.006
3. 81.01
4. 81.0
5. 81

The number obtained from the calculator is 81.00595238 should I just round or are significant figures something else entirely?

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