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lana66690 [7]
3 years ago
5

Explain how dalton’s atomic theory offered a convincing explanation of the observation that mass is conserved in chemical reacti

ons
Chemistry
1 answer:
podryga [215]3 years ago
6 0

Dalton's atomic theory was based on the law of conservation of mass which states that the matter can neither be created nor be destroyed but it can only transformed into one form or another. In a chemical reaction, total mass of the reactants will be equal to the total mass of the products.

Taking an example,

methane+oxygen\rightarrow \text{carbon dioxide}+water

CH_4+2O_2\rightarrow CO_2+2H_2O

Mass of CH_4 = 16g

Mass of 2O_2 = 2\times 32g

Total mass on reactant side = (16+2\times 32)

Total mass on reactant side = 80g

Mass of CO_2 = 44g

Mass of 2H_2O=2\times 18g

Total mass on product side = (44+2\times 18)

Total mass on product side = 80g

It is seen from the above example that the

total mass on reactant side = total mass on product side.


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This is a typical stoichiometry question.To answer this question you want to get a relationship between

N

a

2

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So you can get a relationship between the moles of

N

a

2

O

and moles of NaOH by the concept of stoichiometry.

N

a

2

O +

H

2

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According to above balanced equation we can have the stoichiometry relationship between

N

a

2

O and NaOH. as 1:2

It means 1 moles of

N

a

2

O is required to react with one mol of

H

2

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in terms of mass 1 mole of

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O has mass 62 g on reaction with water produces 2 moles of NaOH or 80 g of NaOH.

62 g of

N

a

2

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1g of NaOH is produced from 62/80 g of

N

a

2

O

1.6 x

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2

g of NaOH will require 62 x 1.6 x

10

2

g / 80 of

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124g of

N

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