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Atomic mass number question

by mawalker
Tags: atomic, mass, number
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Nov8-06, 03:25 PM
P: 53
sorry, i'm having trouble grasping a lot of this... i feel like i have a general understanding of what's going on but a lot of the problems are still confusing to me...

this problem

An element in its solid phase has mass density 1750 kg/m3 and number density 4.39 * 10^28 atoms/m3.

asks what is the element's atomic mass number

i thought that it should just be 4.39*10^28 divided by 1.661 *10^-27 = u, but then i'm not sure where the mass in kg comes in to play
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Max Eilerson
Nov8-06, 03:32 PM
P: 122
1 au = 1.661 *10^-27 Kg.
Nov8-06, 03:35 PM
P: 53
yeah, i know the atomic unit number but how does it relate to mass density?

Nov8-06, 10:31 PM
P: 53
Atomic mass number question

can anyone point me in the right direction? i'm still not getting this
Nov8-06, 10:44 PM
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PF Gold
quasar987's Avatar
P: 4,772

where rho is the mass density, n is the number density and m is the mass of the atoms.

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