<u>Answer:</u> The number of molecules of ethinyl estradiol present in one pill are
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
Given mass of ethinyl estradiol = 0.038 mg = (Conversion factor: 1 g = 1000 mg)
Molar mass of ethinyl estradiol
Putting values in above equation, we get:
According to mole concept:
1 mole of a compound contains number of molecules
So, of ethinyl estradiol will contain = number of molecules
Hence, the number of molecules of ethinyl estradiol present in one pill are