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Alchen [17]
3 years ago
12

Given his arrangement of the periodic table, Mendeleev was able to predict three elements that had not yet been discovered. He p

redicted their atomic weights and chemical properties. How was this possible?
Chemistry
1 answer:
quester [9]3 years ago
6 0

Answer:

Look in explanation.

Explanation:

Mendeleev has ordered the elements based on increasing atomic mass, he has skipped some elements but assumed that they existed and managed to find the atomic mass of the "unknown" elements.

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phosporus can be prepared from calcium phosphate by the following reaction: 2Ca3(PO4)2+6SiO2+10C → 6CaSiO3+P4+10CO Phosphorite i
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Answer:

285 g of P₄

Explanation:

Let's consider the following balanced equation.

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Then, for 1.9 kg of phosphorite:

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