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Lesechka [4]
3 years ago
8

Chemistry class 9 chapter 1​

Chemistry
1 answer:
Aleksandr [31]3 years ago
7 0

Explanation:

i) Melting point = 15°C and Boiling point = 110°C

ii) The region C on graph there is only liquid state, the region A on graph there is only solid state.

iii) The straight line A1 - B1 shows that the melting point of solid wax and getting converted to liquid form.

iv) Latent heat of vaporization is a physical property of a substance.

It is defined as the heat required to change one mole of liquid at its boiling point under standard atmospheric pressure. 

v) At 'B' the wax is at both solid and liquid state

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Kobotan [32]

Mass of CO₂ = 33 g

<h3>Further explanation  </h3>

Complete combustion of Hydrocarbons with Oxygen will be obtained by CO₂ and H₂O compounds.  

If O₂ is insufficient there will be incomplete combustion produced by CO and H and O  

Reaction

CH₄ + 2O₂⇒CO₂ + 2H₂O

mol CH₄ :

\tt =\dfrac{16}{16}=1

mol O₂ :

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A method that can be used to find limiting reactants is to divide the number of moles of known substances by their respective coefficients

\tt CH_4:O_2=\dfrac{1}{1}:\dfrac{1.5}{2}=1:0.75

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So mol CO₂ from limiting reactants

mol CO₂ :

\tt \dfrac{1}{2}\times 1.5=0.75

mass CO₂ :

\tt mass=mol\times MW=0.75\times 44=33~g

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Explanation:

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Explanation:

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