Worksheet Problem #4  [ENDORSED]

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Kristen Laulette 1C
Posts: 10
Joined: Fri Apr 06, 2018 11:03 am

Worksheet Problem #4

Postby Kristen Laulette 1C » Mon Apr 09, 2018 2:20 pm

In a review worksheet posted, problem #4 asks for the molecule that represents: 0.314 mol of a diatomic molecule has a mass of 10.05g. I divided 0.314 mol by the mass of 10.05g and got 32 g/mol.

Don't you somehow have to find the closest atomic mass on the periodic table in order to find out which molecule it is? I know that the homo nuclear diatomic molecules are H2, F2, O2, N2, Br2, Cl2, and I2. None of the atomic masses for these match closely with the atomic mass that I found, but the answer key says it is 02 and I am confused as to why.

How would I determine what diatomic molecule it is?

Bianca Nguyen 1B
Posts: 36
Joined: Fri Apr 06, 2018 11:04 am

Re: Worksheet Problem #4  [ENDORSED]

Postby Bianca Nguyen 1B » Mon Apr 09, 2018 9:47 pm

Remember that there are 2 oxygen atoms in O2. This means that the molar mass of O must be multiplied by 2 in order to get the molar mass of O2. So 16 g/mol of O x 2 is 32 g/mol, which is indeed the molar mass of O2.

Kristen Laulette 1C
Posts: 10
Joined: Fri Apr 06, 2018 11:03 am

Re: Worksheet Problem #4

Postby Kristen Laulette 1C » Sun Apr 15, 2018 10:34 pm

Thank you so much, definitely won't make that mistake again!


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