How many significant figures does this question require?

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Deanna Necula 3B
Posts: 62
Joined: Fri Sep 25, 2015 3:00 am

How many significant figures does this question require?

Postby Deanna Necula 3B » Thu Oct 29, 2015 2:30 pm

The question is: calculate the moles of nickel chloride in 20 mL of a 0.01 M solution. In this problem I convert the volume to liters, where the number of liters would be 0.02L. Therefore, does my answer require the number of significant figures that I get during the conversion or as many as there are when the number is unconverted? I realize in this instance the number of significant figures is the same, but in general, what's the protocol for significant figures when you use a converted number?

Also, the answer to this question uses two significant figures. Shouldn't it be 1?

Thanks!

Michelle Dela Rosa 1D
Posts: 25
Joined: Fri Sep 25, 2015 3:00 am

Re: How many significant figures does this question require?

Postby Michelle Dela Rosa 1D » Fri Oct 30, 2015 8:53 am

I think you would use one significant digit because that is the least precise measurement given in the question. In general, I believe you evaluate the number of significant figures before you convert units accordingly so I would decide based on the numbers provided in the problem. The answer using two significant digits might be a typo, but please let me know if you discover otherwise.


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