# atomic mass number question

by mawalker
Tags: atomic, mass, number
 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
 P: 122 1 au = 1.661 *10^-27 Kg.
 P: 53 yeah, i know the atomic unit number but how does it relate to mass density?
P: 53

## atomic mass number question

can anyone point me in the right direction? i'm still not getting this
 Sci Advisor HW Helper PF Gold P: 4,768 $$\rho=nm$$ where rho is the mass density, n is the number density and m is the mass of the atoms.

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