Calculate the number of atoms in 8.5g of ammonia gas ,NH_3.
A 6.02x10^23
B 0.5x6.02x10^23(My answer)
C 8.5x6.02x10^23
D 0.5x4x6.02x10^23
@Somy

Question

dtan5457 · Answer

That looks correct. You found the number of moles In NH3 from 8.5 grams (0.5) and multiplied it by the avogadro number.

anonymous · Answer

$$Number~of~moles=\frac{ 8.5g }{ 17g~mol^{-1} }$$

anonymous · Answer

Thnx @dtan5457

dtan5457 · Answer

It might be, but I wouldn't have a clue why.

anonymous · Answer

I think it's D since NH3 has 4 atoms

somy · Answer

if you did as u showed in the formula & multiplied the value of mole with Avogadro's number - then yeah, you are correct 
mole= mass/Mr 
mass of COMPOUND given 
Mr u calculated 
Mole OF COMPOUND found * Avogadro's number = number of atoms in the WHOLE COMPOUND

somy · Answer

it doesnt matter how many atoms the compound has 
u used mass of compound 
molecular mass of compound 
and so u got mole of compound 
thus u end up getting number of atoms in total of atoms OF compound

anonymous · Answer

So, the answer is B ?

somy · Answer

bingo :3

anonymous · Answer

Thanks @Somy  @dtan5457

somy · Answer

:)