Question

The vitamin a has a molecular formula c 20 h 30 o. How much no of molecules will be vitamin a has in 500mg capsule?

Answer 1

figure the mole mass of C20H30O?

then number= .005/molmass * avagnumber

Answer 2

Actually that is 500 mg so we first have to convert it into grams
And then find the molar mass of Vitamin A formula which is 286 g.

Now 286g contain 6.023*1023

So 0.5 g contain how much ?


So we simply multiply the NA with the 0.5 and divided by 286

Which gives us about 1.05*10^21

Answer 3

Right

Answer 4

Actually that is 500 mg so we first have to convert it into grams and then into kg and at last we can find the molar mass of Vitamin A formula which is 286 g.

So 500mg = 0.0005kg

So by simply dividing mass by molar mass; we get the required number of molecules.

By solving we get;1.748*10e-6

Answer 5

Avogadro's law
Number of moles ::
no of partiles ÷avogadro number
Where Avogadro number is 6.023*10^23

Answer 6

No of molecules = mass in gram/molar mass × NA

So first we need to convert 500mg into grams so 500/1000 = 0.5

Put the values in formula

= 0.5/274 × 6.02×10²³
= 1.05×10²¹

Answer 7

No.of molecule = mass/ molar mass×NA
molar mass of C20H30O=274
mass=0.5
n=0.5\274×6.02×10^23=1.05×10^21