Question
On combustion of propane, reaction:
If 200gms of propane is burned, then how many grams of water is produced?
- 327.27 grams
- 430.3 grams
- 210.5 grams
- 100.1 grams
Hint:
For the overall reaction, it is important to calculate the molecular mass first.
The correct answer is: 327.27 grams
- On combustion of propane reaction, if 200 grams of propane is burned, then 327.2 grams of water is produced. The reaction formed here is C3H8 + 6O2 = 3CO2 + 4H2O.
- When there is complete combustion, the molecular mass is calculated as atomic mass multiplied by the number of atoms. Here, the atomic mass of carbon is 12 and that of hydrogen is 1. Thus, the molecular mass turns out to be 12 X 3 + 1 X 8 = 44 grams. The molar quantity of propane turns out to be 44 grams.
- n of propane is 200 divided by 44 which gives 4.5 mol. Now, as we have 4 equivalents w.r.t water. So, we get 4.5 X 4 which gives 18 moles and mass comes out to be 326.7 grams.
Number of moles are calculated as mass of substance divided by mass of one mole.
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Aristotle did not believe in Dalton's atomic theory.
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Who has called the smaller particle or the piece “Atomos”?
There is no other element in this universe that is smaller than an atom.
According to law of conservation of mass, the mass of the reactant side must always be ________ to the product side.
The law of conservation of mass was proposed by Antoine Lavoisier.
According to law of conservation of mass, the mass of the reactant side must always be ________ to the product side.
The law of conservation of mass was proposed by Antoine Lavoisier.
All atoms of the same element are identical in __________ and ______.
The elements with the same atomic number and different atomic mass are known as isotopes.
All atoms of the same element are identical in __________ and ______.
The elements with the same atomic number and different atomic mass are known as isotopes.
Which of the following was not explained by Dalton’s atomic theory?
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Which of the following was not explained by Dalton’s atomic theory?
Dalton's atomic theory has many limitations including the inability to explain the presence of isotopes and allotropes.
Which of the following failed the existence of Dalton’s theory?
Dalton's theory is even disproved by the presence of isotopes.
Which of the following failed the existence of Dalton’s theory?
Dalton's theory is even disproved by the presence of isotopes.
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Atomic number is determined by the number of protons and atomic mass is determined by mass of nuclei.
“Dalton’s theory of same element has same mass and properties” was proved wrong by the invention of
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Who proposed “Atoms are indivisible”.
The atoms are chemically neutral. The positive charge is balanced by the negative charge.
Who proposed “Atoms are indivisible”.
The atoms are chemically neutral. The positive charge is balanced by the negative charge.
________ are explanations of observations that are supported by reliable evidence.
To become a theory, a hypothesis needs to be tested a good number of times.
________ are explanations of observations that are supported by reliable evidence.
To become a theory, a hypothesis needs to be tested a good number of times.
All matter is made of small particles called
The positive charge in the atom is known as proton and the negative charge is known as the electron.
All matter is made of small particles called
The positive charge in the atom is known as proton and the negative charge is known as the electron.
