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Stoichiometry is “quantitative relationship” among the “reactants” and the “products” in a “chemical reaction”.
<u>Explanation</u>:
In stoichiometry “stoicheion” means element and “metron” means measure in Greek. The stoichiometric calculation depends upon “stoichiometric coefficients” in a “chemical equation” which can be explained as the “number of moles” of each substance (reactants or products). Stoichiometric calculation is done as follows:
For example reaction between nitrogen and hydrogen to form ammonia as
Here stoichiometric coefficients show that “one molecule of nitrogen” reacts with “three molecules of hydrogen” to form “two molecules of ammonia”. Multiplying Avogadro number to no of molecules in equation:
Taking molar masses into consideration:
Hence balanced equation gives stoichiometric coefficients which gives proportion by moles.
Answer:
4.27 g
Explanation:
We can write that for a gas kept at constant pressure and temperature, the number of moles of the gas is directly proportional to its volume:
Which can be rewritten as
where here we have:
is the initial number of moles
is the initial volume of the gas
is the final volume of the gas
So the final number of moles is
So the number of moles that should be released from the balloon is:
The molar mass of gas N2 is
Therefore, the mass of gas that should be released is: