How Many Hydrogen Molecules Are in 1cm³ of a Balloon?

[lindi]

Homework Statement

In the balloon with volume 4 liters, is 1 gram of hydrogen. How molecules of this gas as found in 1cm3, if the molar mass of hydrogen is 2g/mol?

Homework Equations

pV=nRT

The Attempt at a Solution

in my book the solution final is 7.5*10^19 molecules/cm^3

 

[SteamKing]

Homework Statement

In the balloon with volume 4 liters, is 1 gram of hydrogen. How molecules of this gas as found in 1cm3, if the molar mass of hydrogen is 2g/mol?

Homework Equations

pV=nRT

The Attempt at a Solution

in my book the solution final is 7.5*10^19 molecules/cm^3

What's the definition of a mole?