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Units for t

Posted: Mon Mar 09, 2020 1:30 am
by MaryBanh_2K
What are the correct units for t? The solutions manual leaves it in minutes but aren't the correct units in seconds?

Re: Units for t

Posted: Mon Mar 09, 2020 8:16 am
by Brian_Ho_2B
Time is generally written as seconds (as the standard SI unit); however, it can be represented as minutes or hours depending on the duration of the reaction. If you do happen to change time from seconds to minutes or from hours to minutes and so on, remember to change the value and units of your "k" value so that the units at the end match up.

Re: Units for t

Posted: Mon Mar 09, 2020 8:23 am
by Kishan Shah 2G
You can use whichever units you would like but, as Brian said, make sure the units match up in all of your terms before solving.

Re: Units for t

Posted: Thu Mar 12, 2020 10:33 am
by Luc Zelissen 1K
It easiest if you change the t value to the time value of your rate constant. In this way you can easily multiply and get the right answer without changing the rate constant units.

Re: Units for t

Posted: Thu Mar 12, 2020 10:45 am
by Anna Heckler 2C
t can be in seconds, minutes, or hours, but MUST be consistent across all terms or it will mess up your calculations.

Re: Units for t

Posted: Thu Mar 12, 2020 10:52 am
by 705302428
I think it depends

Re: Units for t

Posted: Thu Mar 12, 2020 11:27 am
by Tanmay Singhal 1H
i think it depends on what the problem asks for. most times in calculations it is seconds

Re: Units for t

Posted: Thu Mar 12, 2020 11:30 am
by Myka G 1l
T can be in either seconds, minutes, or hours depending on what the problem asks for. As before mentioned the same units must be used throughout the problem.

Re: Units for t

Posted: Thu Mar 12, 2020 11:51 am
by Rodrigo2J
t can be in any unit of time depending on what is asked in the problem. Seconds is generally used because it is the SI unit we have associated with time. Just make sure that your units cancel and that the math makes sense.

Re: Units for t

Posted: Thu Mar 12, 2020 11:55 am
by Leonardo Le Merle 1D
Just to ensure I didn't mix up anything I usually convert everything to seconds before trying to solve the problem - if it asks to be expressed in minutes or hours you can convert back at the end.

Re: Units for t

Posted: Fri Mar 13, 2020 11:13 am
by Ying Yan 1F
It usually just depends on the units of the information you were given in the problem. I'm pretty sure you won't be marked wrong if you leave your t in either minutes or seconds (or even hour) as it is the correct number of sec/min/hr. I hope this helped!

Re: Units for t

Posted: Fri Mar 13, 2020 9:54 pm
by Diana Andrade_4F
The units of t depend on the problem, but be consistent when doing calculations!

Re: Units for t

Posted: Fri Mar 13, 2020 10:02 pm
by Samuel Tzeng 1B
The SI units for time is seconds

Re: Units for t

Posted: Fri Mar 13, 2020 10:04 pm
by Alfred Barrion 2H
It honestly depends on the context of the question, but I use seconds because it is the SI unit. It also depends on your k.