Question

What is the mass of 22.4 L of H2O at STP?

A. 18.02 g/mol
B. 1.24 g/mol
C. 24 g/mol
D. 100 g/mol

Answer 1

The mass of 22.4 L of H2O at STP IS 18.0 grams

calculation

mass = moles x molar mas
Calculate the moles of water at STP

At STP 1 mole =22.4 L
what about 22.4 l of H2O

by cross multiplication


1mole x22.4 L/22.4 L = 1 mole


molar mass of water = (1 x2) + 16 =18 g/mol

moles is therefore = 8 g/mol x 1 mol = 18 grams