Chemistry
(a) What do you mean by stoichiometry?
(b) Define atomicity of a gas. State the atomicity of Hydrogen, Phosphorus and Sulphur.
(c) Differentiate between N2 and 2N.
Mole Concept
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Answer
(a) Stoichiometry measures quantitative relationships, and is used to determine the amount of products/reactants that are produced/needed in a given reaction. Describing the quantitative relationships among substances as they participate in chemical reactions is known as reaction stoichiometry.
(b) Atomicity is the number of atoms in a molecule of an element.
Atomicity of hydrogen is 2, phosphorus is 4 and sulphur is 8.
(c) Difference between N2 and 2N
| N2 | 2N |
|---|---|
| It means 1 molecule of nitrogen. | It means two atoms of nitrogen. |
| It can exist independently. | It cannot exist independently. |
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Related Questions
State:
(a) Gay-Lussac's Law of combining volumes.
(b) Avogadro's law
Explain Why?
(a) "The number of atoms in a certain volume of hydrogen is twice the number of atoms in the same volume of helium at the same temperature and pressure."
(b) "When stating the volume of a gas, the pressure and temperature should also be given."
(c) Inflating a balloon seems to violate Boyle's law.
Calculate the volume of oxygen at STP required for the complete combustion of 100 litres of carbon monoxide at the same temperature and pressure.
2CO + O2 ⟶ 2CO2
200 cm3 of hydrogen and 150 cm3 of oxygen are mixed and ignited, as per the following reaction,
2H2 + O2 ⟶ 2H2O
What volume of oxygen remains unreacted?