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How many molecules of NH3 are in 44.8L of NH3?

a. 6.02x10^23 molecules NH3
b. 1.20x10^24 molecules NH3
c. 2.00 molecules NH3
d. 44.8 molecules NH3

b. 1.20x10^24 molecules NH3

Explanation:

At STP, one mole of gas has a volume of 22.4 dm^3

1 dm^3 = 1 L

Therefore,

44.8 L = 44.8 dm^3

This means that there are 2 moles of NH3 in 44.8 L at STP.

number of molecules = number of moles times avogadro's number

Avogadro's number = 6.02x10^23

Numner of molecules = 2 x 6.02x10^23

= 1.204x10^23 molecules