Question

the maximum number of molecules is present in1) 15 L of water at STP2) 15L of H2O gas at STP3) 15 g of ice4) same in all

Answer 1

hi friend!
Option (i) 15 L of water at STP has maximum number of molecules. It is because at same temperatture and pressure, liquid water has maximum density than equal volume of ice and water vapour. Therefore, 15 L of water will have maximum molecules than 15 L of H2O gas and 15 L of Ice.