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ally1784:
Guys, why is part a 5 and part b 2.5
n = m/M

Sine:

--- Quote from: ally1784 on January 05, 2021, 10:02:00 pm ---Guys, why is part a 5 and part b 2.5
n = m/M


--- End quote ---
I think you need to consider an alternative formula for n

n = N/Na

where
n = moles
N = number of particles (e.g. particles of H2)
Na = avagadro's constant which is 6.02 x 10^23

Edit: misread the q (didnt see the "in mol" part. See below for the correct answer.

Bri MT:
A H2 molecule has twice the mass of one H atom.

You then do:
n(H2) = m/M = 5/2 = 2.5   and n(H) = m/M = 5/1 = 5


Hope this helps :)

ally1784:
How do I know that I'm looking for just one H atom (part a) because at the start I thought I was looking for H2, and that's how I got the answer 2.5?

Chocolatepistachio:
Part a it’s H2 so you just do n=m/M and then x the answer by 2 because there are 2 atoms of H . B it’s just H so you don’t need to x 2

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