Sig Figs in % Yield

Moderators: Chem_Mod, Chem_Admin

Drew Myers 4G
Posts: 100
Joined: Sat Aug 17, 2019 12:17 am

Sig Figs in % Yield

Postby Drew Myers 4G » Sat Oct 05, 2019 12:12 am

Imagine that a problem asks you to find the percent yield but wants 2 sig figs, and the end answer you get is 63.5%. Would that round up to 64% or down to 63%, and why?

Chem_Mod
Posts: 18878
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 714 times

Re: Sig Figs in % Yield

Postby Chem_Mod » Sat Oct 05, 2019 12:34 am

You would use normal rounding rules and round up to 64%.

AniP_2D
Posts: 95
Joined: Sat Aug 17, 2019 12:17 am

Re: Sig Figs in % Yield

Postby AniP_2D » Sat Oct 05, 2019 11:31 am

Usually when you are given a decimal that is .5 or higher, you would round up to the next whole number.

Shanzey
Posts: 120
Joined: Wed Sep 18, 2019 12:20 am

Re: Sig Figs in % Yield

Postby Shanzey » Sat Oct 05, 2019 5:04 pm

If we were to do sig figs for a percent yield question, would we use the significant figures of the grams given for the actual yield?

Amanda Mei 1B
Posts: 109
Joined: Sat Aug 24, 2019 12:16 am

Re: Sig Figs in % Yield

Postby Amanda Mei 1B » Sat Oct 05, 2019 5:34 pm

Shanzey wrote:If we were to do sig figs for a percent yield question, would we use the significant figures of the grams given for the actual yield?


Yes, you would.

Jacob Motawakel
Posts: 103
Joined: Wed Sep 18, 2019 12:20 am
Been upvoted: 1 time

Re: Sig Figs in % Yield

Postby Jacob Motawakel » Sat Oct 05, 2019 5:40 pm

You would round up to 64%

emwoodc
Posts: 45
Joined: Fri Aug 09, 2019 12:16 am

Re: Sig Figs in % Yield

Postby emwoodc » Sun Oct 06, 2019 11:05 pm

according to the rounding rule, it should be 64%

PriscillaLi_3G
Posts: 63
Joined: Fri Sep 27, 2019 12:30 am

Re: Sig Figs in % Yield

Postby PriscillaLi_3G » Fri Oct 11, 2019 11:27 am

When I am solving a problem, do I have to keep in mind the sigfigs throughout all the calculations? Or just keep the right sigfigs for the final answer.

Megan Ngai- 3B
Posts: 50
Joined: Fri Aug 09, 2019 12:17 am

Re: Sig Figs in % Yield

Postby Megan Ngai- 3B » Fri Oct 11, 2019 2:45 pm

It would round up toe 64%, the next whole number

Tiffany Vo 3G
Posts: 52
Joined: Sat Aug 17, 2019 12:17 am

Re: Sig Figs in % Yield

Postby Tiffany Vo 3G » Fri Oct 11, 2019 3:13 pm

PriscillaLi_3G wrote:When I am solving a problem, do I have to keep in mind the sigfigs throughout all the calculations? Or just keep the right sigfigs for the final answer.


I think you just need to keep the same sig figs for the final answer because it's better for accuracy to round at the end. I'm pretty sure rounding down your numbers while you're still computing could mess up your values.

Khushboo_3D
Posts: 60
Joined: Wed Sep 18, 2019 12:19 am

Re: Sig Figs in % Yield

Postby Khushboo_3D » Fri Oct 11, 2019 3:56 pm

You would round up to 64%. This because when number ends in 5, you would round it up to the closest even number according to the rule.


Return to “Significant Figures”

Who is online

Users browsing this forum: No registered users and 2 guests