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Sladkaya [172]
1 year ago
13

Use Dalton’s theory to explain why potassium nitrate from India or Italy has the same mass percents of K, N, and O.

Chemistry
1 answer:
SVEN [57.7K]1 year ago
4 0

According to Dalton, every atom in an element has the same mass, and compounds are made up of a particular ratio of several elements. Thus the mass percentages of K, N, and O in potassium nitrate from India and Italy are the same.

The laws of conservation of mass and constant composition served as the foundation for Dalton's theory. In the first section of his thesis, he claims that all matter is composed of indivisible atoms. According to the second component of the theory, the mass and characteristics of every atom in a specific element are the same. Parts of the theory had to be modified based on the existence of subatomic particles and isotopes.

Learn more about Dalton's theory here:

brainly.com/question/1403872

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Answer:

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Explanation:

To solve the problem, we have to express the enthalpy of combustion (ΔHc) in kJ per mole (kJ/mol).

First, we have to calculate the moles of methane (CH₄) there are in 2.50 g of substance. For this, we divide the mass into the molecular weight Mw) of CH₄:

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moles CH₄ = mass CH₄/Mw(CH₄)= 2.50 g/(16 g/mol) = 0.15625 mol CH₄

Now, we divide the heat released into the moles of CH₄ to obtain the enthalpy per mole of CH₄:

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Therefore, the enthalpy of combustion of methane is -800 kJ/mol (the minus sign indicated that the heat is released).

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