How many moles of tungsten atoms are in 4.8*10^25 atoms of tungsten?
a. 800 moles
b. 80 moles
c. 0.13 moles
d. 0.013 moles

Question

How many moles of tungsten atoms are in 4.8*10^25 atoms of tungsten? 
a. 800 moles 
b. 80 moles 
c. 0.13 moles 
d. 0.013 moles

anonymous · Answer

@AccessDenied

anonymous · Answer

@ghazi

anonymous · Answer

@Preetha

ghazi · Answer

number of moles $$n=\frac{ w }{ m }$$ but here you have been given atoms and one mole =6.022 *10^23 atoms there fore number of moles are $$n=\frac{ 4.8*10^{25} }{ 6.022*10^{23} }=79.707 $$

ghazi · Answer

@Sunshine447  hope that helps you

anonymous · Answer

@ghazi but how did you get 79.707?

ghazi · Answer

i think i made a mistake, its 7.9707 moles

ghazi · Answer

just a division of the numbers i have written above

anonymous · Answer

not an answer....

anonymous · Answer

my teacher said to round up, so i think 79.707 was correct....

ghazi · Answer

one mole has 6.02*10^23 atoms 
1 atom is there in 1/6.02 *10^23 moles 
therefore 4.8 *10^25 will be in 4.8*10^25/6.02*10^25 and answer is B

ghazi · Answer

round it to nearest 10

ghazi · Answer

is that clear now? @Sunshine447  :D

anonymous · Answer

yeah, thanks :D

ghazi · Answer

:)