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You can find the mass of one mole of each of the individual elements by looking at the mass numbers.
So, 1 mole of:
N=14g
H=1g
since there are 3 H's the total mass of 1 mole NH3 is 14+3=17g
You then multiply the actual number of moles by the g's per mole:
=> 17x2.11=35.87g
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Formula for moles?
number of moles = mass of the material/molar mass
