Question

How many number of molecule present in 15 g of ice ?

Answer 1

No of molecules = no of moles× Na (Avogadro no)

Since we dont have no of moles ,we need to find that from the goven mass.

No of moles= given masss/molar mass
Molar mass of ice(water-H2O)=＞ 1×2+16=18

moles=15/18 = 0.8334

Hence no of molecules= 0.8334×6.022×10²³= 5.01×10²³molecules