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How many molecules are present in 7 × 10^-3 m^3 of NH3 at STP?

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How many molecules are present in 7 × 10-3 m3 of NH3 at STP?

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Molar volume = 22.4 dm3 = 2.24 × 10-2 m3 

2.24 × 10-2 m3 of NH3 at STP contains 6.023 × 10 23 NH3 molecules.

:. 7 × 10-3 m3 of NH3 will contain

= \(\frac{6.023\times10^{23}}{2.24\times10^{-2}}\) x 7 x 10-3

18.82 × 1022 NH3 molecule

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