Question

1. Aspirin has the molecular formula C9H804. How many atoms are there in a tablet weighing 360 mg ?
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Answer 1

Answer:

Explanation:

Aspirin:-c9H8O4

Molecular weight is (12×9+1×8+16×4)=180gms

Given weight is 360mg =360×10^-3 grams

No.of moles =Given weight ÷molecular weigh

No.of moles is 3×10^-3 moles

For one of aspirin ----6.023×10^23 atoms

Then for 3×10^-3 moles of aspirin total no.of atoms are x(say)

Then x=3×6.023×10^20÷1

Therefore x is 18.069×10^20 atoms

ALL THE BEST

Answer 2

Explanation:

Molar Mass =12×2+1×8+16×4

=108+72 =180

Avograde no.

Aspirine = 6.022 × 10^23

0.36g = ?

180/ 0.36 = 6.022 × 10^23

= 6.022 × 10^23 × 0.36/ 180

= 6022 × 10^23 × 36/ 18 × 10^6

= 12. 044 × 10^ 20 molecules