Question

when 100 g of ethylene polymerises entirely to polythene, the weight of polythene formed as per equation nCH2 = CH2 --> (CH2 - CH2)n is

Answer 1

Answer:

Weight of polythene formed as per equation is 100 g.

Explanation:

$nCH_2=CH_2\rightarrow (CH_2-CH_2)_n$

Mass of ethylene = 100 g

Moles of ethylene = $\frac{100 g}{28 g/mol}=3.5714 mol$

Number of molecules of ethylene= n = $3.5714 mol\times N_A$

On polymerization  $3.5714 mol\times N_A$ molecules of ethylene are joined with one another that is Law of Conservation of Mass

Mass of $-(CH_2-CH_2)-$ unit = 28 g/mol

Moles of $3.5714 mol\times N_A$ units of $-(CH_2-CH_2)-$ :

$\frac{3.5714 mol\times N_A}{N_A}=3.5714 mol$

Mass of $3.5714 mol\times N_A$ units of $-(CH_2-CH_2)-$ :

$3.5714 mol\times 28 g/mol=100 g$

Weight of polythene formed as per equation is 100 g.

Answer 2

Answer:Weight of polythene formed as per equation is 100 g.

Explanation:

Mass of ethylene = 100 g

Moles of ethylene =  

Number of molecules of ethylene= n =  

On polymerization   molecules of ethylene are joined with one another that is Law of Conservation of Mass

Mass of  unit = 28 g/mol

Moles of  units of  :

Mass of  units of  :

Weight of polythene formed as per equation is 100 g.