Solution:
According to the Avogadro's number:
6.022 *10^23 drops per 0.050 g/ drop = 3.011 *10^22 grams per mole of drops
3.011 *10^22 grams per 1 kg / 1000 grams = 3.011 *10^19 kilograms / mole of drops
thus the answers are:
3.0 *10^22 grams per mole of drops
3.0 *10^19 kilograms per mole of drops
And,
In the calculation of how many moles of raindrops in the Pacific Ocean is:
7.08X10^20kg per 3.0 *10^19 kilograms per mole of drops = 23.5 moles of drops
This is the required solution.