Molecular Formula

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sarahartzell1A
Posts: 56
Joined: Fri Sep 28, 2018 12:17 am

Molecular Formula

Postby sarahartzell1A » Thu Oct 04, 2018 6:25 pm

How do you write the molecular formula for a compound when given the diagram of the molecular structure? (such as in question F.1 in the sixth edition for example)

melodyzaki2E
Posts: 61
Joined: Fri Sep 28, 2018 12:18 am

Re: Molecular Formula

Postby melodyzaki2E » Thu Oct 04, 2018 6:32 pm

In that question they tell you that the diagram shown is the molecular structure, so I think you could just count out each of the atoms and that would give you the molecular formula. That one confused me too.

Sydney Stump
Posts: 30
Joined: Fri Sep 28, 2018 12:17 am

Re: Molecular Formula

Postby Sydney Stump » Thu Oct 04, 2018 6:40 pm

Yeah, since the molecular structure is shown you only have to count the number of molecules for each element to find the molecular formula.

SydBenedict2H
Posts: 60
Joined: Wed Nov 08, 2017 3:00 am

Re: Molecular Formula

Postby SydBenedict2H » Sat Oct 06, 2018 9:52 pm

How do you know which order they should go in though?

Jaqueline Monreal 2L
Posts: 57
Joined: Fri Sep 28, 2018 12:28 am

Re: Molecular Formula

Postby Jaqueline Monreal 2L » Sun Oct 07, 2018 12:12 pm

Because the molecular formula basically tells exactly the amount of atoms that are in each element and not the ratio, then all you have to do is count how many atoms are of each element type and make them your subscript for that element in the molecular formula

AlyssaBei_1F
Posts: 99
Joined: Fri Sep 28, 2018 12:17 am

Re: Molecular Formula

Postby AlyssaBei_1F » Sun Oct 07, 2018 1:50 pm

The molecular formula tells you how many atoms there are per element, so all you would need to do is count the atoms. You would not be able to do this with the empirical formula though because the empirical formula is a ratio.

Porus_Karwa_2E
Posts: 72
Joined: Fri Sep 28, 2018 12:24 am

Re: Molecular Formula

Postby Porus_Karwa_2E » Sun Oct 07, 2018 3:04 pm

All you have to do is count the atoms out for the molecular formula.

yuetao4k
Posts: 60
Joined: Fri Sep 28, 2018 12:27 am
Been upvoted: 1 time

Re: Molecular Formula

Postby yuetao4k » Sun Oct 07, 2018 3:08 pm

If atoms are linked together, they form one compound. Count up each type of atom to form the compounds used in the equation and use them to make a balanced chemical equation.

Estelle Jung
Posts: 31
Joined: Fri Sep 28, 2018 12:29 am

Re: Molecular Formula

Postby Estelle Jung » Sun Oct 07, 2018 4:33 pm

The molecular formula consists of the exact number of atoms for each element, whereas the empirical formula is the exact ratio of these atoms.
ex) molecular formula: H2O2 & empirical formula: HO (1:1 ratio)

Brandon Sanchez 3J
Posts: 30
Joined: Wed Oct 03, 2018 12:16 am

Re: Molecular Formula

Postby Brandon Sanchez 3J » Sun Oct 07, 2018 4:43 pm

All you have to do is count the number of atoms that the molecule has and the number of atoms is your subscript for the element in the M.F.

Alli Hinmon 3E
Posts: 30
Joined: Wed Nov 08, 2017 3:00 am

Re: Molecular Formula

Postby Alli Hinmon 3E » Sun Oct 07, 2018 4:50 pm

I counted the number of atoms that make up the molecule.

Layla Manoochehri
Posts: 29
Joined: Fri Sep 28, 2018 12:28 am

Re: Molecular Formula

Postby Layla Manoochehri » Sun Oct 07, 2018 10:46 pm

so how do I know what order to put the elements in when naming it then?

Jaifreen_Bhangu_3K
Posts: 34
Joined: Fri Sep 28, 2018 12:26 am

Re: Molecular Formula

Postby Jaifreen_Bhangu_3K » Sun Oct 07, 2018 11:01 pm

Yes, all you have to do is count the atoms.


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