## Sunshine447 3 years ago 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

1. Sunshine447

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2. Sunshine447

@ghazi

3. Sunshine447

@Preetha

4. ghazi

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 $n=\frac{ 4.8*10^{25} }{ 6.022*10^{23} }=79.707$

5. ghazi

@Sunshine447 hope that helps you

6. Sunshine447

@ghazi but how did you get 79.707?

7. ghazi

i think i made a mistake, its 7.9707 moles

8. ghazi

just a division of the numbers i have written above

9. Sunshine447

10. Sunshine447

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

11. ghazi

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

12. ghazi

round it to nearest 10

13. ghazi

is that clear now? @Sunshine447 :D

14. Sunshine447

yeah, thanks :D

15. ghazi

:)