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### Topic: Relative atomic mass  (Read 1938 times)

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#### Bird of paradise

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##### Relative atomic mass
« on: September 11, 2023, 09:50:27 PM »
A compound has a formula M3N where M is a metal element and N is nitrogen. It contains 0.673 grams of N per gram of the metal M. Determine the relative atomic mass of M and its identity?

#### Hunter2

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##### Re: Relative atomic mass
« Reply #1 on: September 12, 2023, 01:18:13 AM »
Show your own atempt first.

#### Hunter2

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##### Re: Relative atomic mass
« Reply #2 on: September 12, 2023, 06:16:02 AM »
Calculate the moles of nitrogen N first.
How many moles of Metal correspond to it?
Backward you can calculate the molar weight from this number and the given mass.

#### ProfOxidizer

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##### Re: Relative atomic mass
« Reply #3 on: September 18, 2023, 08:58:58 AM »
The metal M is lithium with atomic mass equal to 6.94 u.

#### Hunter2

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##### Re: Relative atomic mass
« Reply #4 on: September 18, 2023, 12:03:55 PM »

#### ProfOxidizer

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##### Re: Relative atomic mass
« Reply #5 on: September 18, 2023, 01:06:03 PM »

Ok, sorry. It was inappropriate.

#### gavindor

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##### Re: Relative atomic mass
« Reply #6 on: October 10, 2023, 07:33:18 PM »
well technically he didn't give a final answer 'cos the question asked for "relative atomic mass", and he gave atomic mass!

There might be a difference between relative atomic mass and atomic mass, e.g. that one has a unit and the other doesn't!

#### Hunter2

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##### Re: Relative atomic mass
« Reply #7 on: October 11, 2023, 12:32:08 AM »
He gave the number, doesnt matter in u or g/ mol.

#### Borek

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##### Re: Relative atomic mass
« Reply #8 on: October 11, 2023, 02:57:07 AM »
He gave the number, doesnt matter in u or g/ mol.

Just to remind you that Mars Climate Orbiter crashed because while numbers were right, units were wrong.
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