## Sig Figs

Jamie Reniva 1J
Posts: 14
Joined: Wed Nov 15, 2017 3:00 am

### Sig Figs

I noticed in the empirical formula problems in in the post module assignment, some of the elements are rounded off. For example Hydrogen (instead of 1.008, it is stated as 1.0), Oxygen (instead of 15.999, it is used as 16), do we stick to this concept where we round the numbers and not put the exact same numbers? Does it matter?

Susu Le 1F
Posts: 30
Joined: Thu Feb 01, 2018 3:01 am
Been upvoted: 1 time

### Re: Sig Figs

We should use the numbers given on the periodic table so that we can get a more accurate answer.

Andre-1H
Posts: 39
Joined: Fri Apr 06, 2018 11:01 am

### Re: Sig Figs

I'm pretty sure the periodic table is used 99% of the time, you would only really use 1 for hydrogen if you did not have/were not allowed to use a calculator.

Gisselle Sainz 2F
Posts: 76
Joined: Wed Feb 21, 2018 3:00 am

### Re: Sig Figs

Whether you choose to round or not you should still end up with an answer relatively close to what is correct. I do not think it matters all too much.

Bijal Luhar
Posts: 33
Joined: Fri Apr 06, 2018 11:03 am

### Re: Sig Figs

When we get into the part of class when sig figs matter always use the exact number on the periodic table as it gives the most accurate and precise answer!

Briana Lopez 4K
Posts: 44
Joined: Wed Nov 22, 2017 3:01 am

### Re: Sig Figs

Also, this may come in handy when we start using them more, but it was mentioned in class how the final answer should have the least amount of significant figures. If one part of the problem has 3 sig figs and the other part has 6 sig figs, then I think your final answer should be rounded to 3 sig figs.

NabilaNizam-1K
Posts: 30
Joined: Fri Apr 06, 2018 11:04 am

### Re: Sig Figs

In case of calculations that require the usage of values from the periodic table, are we supposed to use the exact value stated or should we round it up?

Posts: 32
Joined: Sun Dec 10, 2017 3:02 am
Been upvoted: 1 time

### Re: Sig Figs

I believe that rounding up is correct as long as it is consistent. If the answer is relatively close I don't think there would be a problem.

Posts: 31
Joined: Fri Apr 06, 2018 11:03 am

### Re: Sig Figs

NabilaNizam-1K wrote:In case of calculations that require the usage of values from the periodic table, are we supposed to use the exact value stated or should we round it up?

I believe that for calculations that require the usage of values from the periodic table, we should use the exact value stated for the element in order to obtain the most accurate answer. Then, we should round up the answer to the correct significant figure according to the information given in the problem.

fara valdez
Posts: 48
Joined: Fri Apr 06, 2018 11:05 am

### Re: Sig Figs

You should typically have/use an updated and accurate periodic table.