Question

HOW MANY MOLECULES OF ASPIRIN (molar mass=180 amu)ARE PRESENT IN 50MG TABLET?​

Answer 1

Answer:

Molar mass of aspirin (C9H8O4)= 180 u

Mass of aspirin= 50 mg= 0.05g

Number of moles,n=  Mass/Molar mass

Number of molecules= n x 6.023 x 1023

n=0.05180=0.00027n=0.05180=0.00027

Number of molecules= 0.00027 x 6.023 x 1023

                                 =0.0016262 x 10^23 or 1.6262 x 10^26 molecules

Answer 2

Answer:

Explanation:

And so, for  

C

9

H

8

O

4

we gots a molecular mass of  

180.16

⋅

g

⋅

m

o

l

−

1

...

And so  

moles of aspirin

=

0.250

⋅

g

180.16

⋅

g

⋅

m

o

l

−

1

=

0.001388

⋅

m

o

l

And to get the number of molecules we simply multiply this molar quantity by the  

Avocado number

....

0.001388

⋅

m

o

l

×

6.02214

×

10

23

⋅

m

o

l

−

1

=

8.36

×

10

20

individual aspirin molecules.