Question

a 20 cm long cylinder of radius 5cm is filled up with nh3 gas at stp calculate the no. of moles of nh3 in cylinder

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Answer 1

Answer:

Given mass of NH3 = 68 g

Molecular Mass of NH3 = 14 + (3×1) = 17 g

17 g of NH3 occupies 22.4 litres

1 g of NH3 occupies 22.4 / 17

68 g of NH3 occupies 22.4 / 17 × 68 = 89.6 litres

Number of moles = Given mass / Molecular Mass

= 68 / 17 = 4

Number of molecules = Number of moles × Avogadro Number

= 4 × 6.022 × 10^23

= 24.088 × 10^23

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