Question

Calculate the no of moles of H2 required for hydrogenation of 140g of ethene​

Answer 1

Answer: Explanation:

P⋅V2=n2⋅RT → for hydrogen. The pressure and the temperature are the same for both gases, since the reaction presumably takes place at STP. The mole ratio is equivalent to the volume ratio. Notice that you have a 1:2 mole ratio between ethyne and hydrogen gas.

Answer 2

5 moles of hydrogen are required.

Given - Mass of ethene

Find - Number of moles

Solution - The chemical reaction is as follows -

C2H4 + H2 --Ni/Pd--> C2H6

1 mole of ethene requires 1 mole of Hydrogen.

So, calculating number of moles of ethene.

Number of moles = mass/molar mass

Molar mass = 28 g/mol

Number of moles = 140/28

Number of moles = 5

So, 5 moles of ethene will require 5 moles of hydrogen.

Hence, the number of moles required for hydrogen are 5.

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