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aliviadushane
06.07.2019 •
Chemistry
How do i classify elements the way that the periodic table was classified?
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Ответ:
The question doesn't really make sense, but I am pretty sure the answer is atomic number.
Ответ:
Answer : The correct option is (d) 1.5 g K, 0.38 g O₂
Explanation :
The molar masses of potassium and oxygen are very close to each other. Therefore we can assume them to be equal. If we assume that, then according to reaction stoichiometry, 4 moles of K are needed to react with 1 mol of O₂. Since the molar masses are assumed to be equal , we can say that the mass of potassium needed to react with that of oxygen should be 4 times the mass of oxygen.
From the given options, the only option that has less amount of K is option d.
Here, 0.38 g of oxygen needs 0.38 x 4 = 1.52 g of K. But the given mass of potassium is 1.5 g which is less. This indicates that potassium is the limiting reactant as we do not have enough potassium to completely react with all of the oxygen.
Therefore option d is the correct option