Sig Figs in homework problems

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Dakota Walker 1L
Posts: 58
Joined: Wed Sep 18, 2019 12:17 am

Sig Figs in homework problems

Postby Dakota Walker 1L » Tue Oct 01, 2019 10:09 pm

Because there are so many different significant figures that can be used for molar masses, for example Hydrogen could be 1.01, 1.008, etc, how does this work with significant figures? If you use 1.01 can you only use 2 decimal places in your final answer?

105311039
Posts: 107
Joined: Fri Aug 02, 2019 12:16 am

Re: Sig Figs in homework problems

Postby 105311039 » Tue Oct 01, 2019 10:11 pm

Throughout the problem you identify the number with the least amount of Sig Figs and thats what you base you answer off of.

Abigail Menchaca_1H
Posts: 104
Joined: Sat Sep 07, 2019 12:19 am

Re: Sig Figs in homework problems

Postby Abigail Menchaca_1H » Tue Oct 01, 2019 10:19 pm

105311039 wrote:Throughout the problem you identify the number with the least amount of Sig Figs and thats what you base you answer off of.

Ya so irregardless of the numeric value of molar mass you use in the equation, you are writing your answer based on the value with the lowest sig figs.

KayleyW_3L
Posts: 55
Joined: Wed Sep 18, 2019 12:19 am

Re: Sig Figs in homework problems

Postby KayleyW_3L » Tue Oct 01, 2019 10:20 pm

You should use the information given in the problem to determine the value with the lowest number of sig figs. Even if you use 1.01 for Hydrogen in your calculations, unless that info is given in the problem, use the lowest value sig figs from the original info.

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

Re: Sig Figs in homework problems

Postby Megan Ngai- 3B » Tue Oct 01, 2019 10:50 pm

For example, the problem had the numbers 3.45g and 100.79 g.

You should base the number of sig figs on the original problem. Even if you used a the atomic mass of 1.008 for hydrogen in your calculations, the sig figs should be based on 3.45g (3 sig figs) not 100.79 or 1.008.


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