Sig figs for Avogadro's number

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005199750
Posts: 32
Joined: Fri Sep 28, 2018 12:27 am

Sig figs for Avogadro's number

Postby 005199750 » Thu Oct 04, 2018 10:19 pm

Where should we round Avogadro's number to? When I use it in my calculations, should I write it as 6.022140857 × 10^23 , 6.0221 × 10^23 , or 6.022 × 10^23 , etc.?

Samantha Kwock 1D
Posts: 61
Joined: Fri Sep 28, 2018 12:24 am

Re: Sig figs for Avogadro's number

Postby Samantha Kwock 1D » Thu Oct 04, 2018 10:21 pm

I believe that Avogadro's number is typically rounded off to 6.022 x 10^23.

Matthew Choi 2H
Posts: 59
Joined: Fri Sep 28, 2018 12:18 am

Re: Sig figs for Avogadro's number

Postby Matthew Choi 2H » Fri Oct 05, 2018 3:25 am

In high school chemistry, I typically used 6.02*10^23 as Avogadro's number, but in lecture I remember Lavelle saying that we should use 6.022*10^23. I guess we can use that extra sig fig now that we are grown college students.

Mhun-Jeong Isaac Lee 1B
Posts: 54
Joined: Fri Sep 28, 2018 12:17 am

Re: Sig figs for Avogadro's number

Postby Mhun-Jeong Isaac Lee 1B » Fri Oct 05, 2018 3:44 am

Allow me to reaffirm the statements of the above responses. I have physical evidence of Dr. Lavelle approval of the use of 6.022*10^23 for Avogadro's number in my notes that I have taken on the first lecture day.


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