A sample of NH3 occupies 75.0 litres at STP How many molecules is this?

Answer 1

Assuming that this is ammonia (NH3) gas, we can use the approximation that all gases at STP occupy a volume of 22.4 L / mole.

75.0 L x (1 mole / 22.4 L) x (6.02 x 10^23 molecules / 1 mole) = 2.02 x 10^24 molecules

Answer 2

Use the equation PV=nRT P=one million atm V=75 L n= style of moles R= 0.082057 T= 273.15 ok as quickly as you remedy for n, use the mole ratio for NH3 to discover how many molecules there are. The mole ratio is the atomic mass of the molecule (Nitrogen + 3 Hydrogen). Multiply that by making use of the style of moles got here across interior the 1st equation.