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Keith_Richards [23]
3 years ago
5

Mention any three drawbacks of Mendeleev periodic table.​

Chemistry
1 answer:
Lady_Fox [76]3 years ago
7 0

Answer:

The three drawback of mendeleev periodic table are as follow :

1 Position of hydrogen:

2Anamlous pairs

3 Position of isotopes

Explanation:

hope it will help u ✌️

good day

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What is the average rate of formation of i2? express your answer to three decimal places and include the appropriate units. view
Klio2033 [76]
Missing question:
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Veronika [31]

Answer:co2

Explanation:

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3 years ago
8. What is the heat of reaction when hydrogen and oxygen combine to form water?
valina [46]

Answer:

The heat of reaction when hydrogen and oxygen combine to form water is :

<u>C. 571.6 kJ</u>

Explanation:

Enthalpy Change = The enthalpy change for the formation of 1 mole of the substance from their standard state is called the enthalpy of formation.

This is intensive quantity as it is fixed for 1 mole .

Intensive properties = Those properties which are independent on the amount of the substance are intensive properties.

The value of these quantities does not get halve if you divide the substance into two equal parts. example , density, refractive index.

However , the enthalpy of reaction is extensive. Because on increasing the amount the value of the enthalpy also get doubles

Hence for this reaction :

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Its value is -285.8 kJ for 1 mole

And here two moles are present . so the value of molar enthalpy is:

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Cloud [144]

Answer: (Chlorine-35)

Element X is Ca

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Number of proton plus the number of electron gives the mass number.

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