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Alex73 [517]
3 years ago
15

How do the Modern Periodic Table remove the various anomalies of Mendeleev's Periodic Table?

Chemistry
1 answer:
Darya [45]3 years ago
8 0

Answer:

1) Mendeleev's periodic table grouped elements on the basis of their atomic masses, while the modern periodic table groups elements on the basis of atomic number.

2) As we know, the isotopes of an element will have the same atomic number. This is because there number of protons will be same. Hence, in the modern periodic table the isotopes of an element share the same place.

3) Cobalt is places on the 9th position and nickel on the 10th position. There were arguments before as the atomic mass of nickel was more than cobalt.

4) A position for the hydrogen atom was finally allocated in the modern periodic table which had been a issue in Mendeleev's periodic table. Hydrogen is placed on top of the alkali metals i.e the first group.  

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If the CaCO3 weighed 983 g and the CaO weighed 551 g, how many grams of CO2 were formed in the reaction?
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Answer:

The answer to your question is 432 g of CO₂

Explanation:

Data

CaCO₃  = 983 g

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CO₂ = ?

Balanced reaction

                               CaCO₃ (s)   ⇒   CaO (s)   +  CO₂ (g)

This reaction is balanced, to solve this problem just remember the Lavoisier Law of conservation of mass that states that the mass of the reactants is equal to the mass of the products.

                    Mass of reactants = Mass of products

                    Mass of CaCO₃   = Mass of CaO + Mass of CO₂

Solve for CO₂

                    Mass of CO₂  = Mass of CaCO₃ - Mass of CaO                    

                     Mass of CO₂ = 983 g - 551 g

Simplification

                     Mass of CO₂ = 432 g                        

         

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