Hello student ,

Generally 1 mole of a substance contains Avogadro Number of molecules that is 6.022 × 10^23 therefore

1. 28g of N2 = 1 mole = 6.022×10^23 molecules.                             Therefore 7g of N2 = 7/28 = 0.25 mole =  6.022× 10^23/4 = 1.505×10^23 molecules .
2. 2g of H2 = 1 mole = 6.022×10^23 molecules
3. 16g of O2 = 1 mole = 6.022×10^23 molecules            Therefore 8g of O2 = 8/16=0.5mole = 6.022×10^23/2= 3.011×10^23 molecules.
4. 46g of NO2 = 1mole=6.022×10^23 molecules            Therefore 20g of NO2 = 20/46=0.434 moles = 6.022×10^23*0.434= 2.6×10^23 molecules

Thus 2g of H2 has the highest number of molecules among the given elements/compounds

A material at a certain temperature does not have all of its particles at the same energy. In the basic definition of the word, "temperature" is the average random motional (kinetic) energy of the particles of a material. (Thermodynamics gives a broader definition to temperature, but we don't need this definition here.) Did you notice the word "average" in the basic definition? Just because we can assign a single number to the temperature of an object that is in thermal equilibrium does not mean that every atom of the material is moving with the same energy because of the nature of averaging. If the average height of everyone in the room is 5 feet 9 inches, this does not imply that everyone in the room is 5 feet 9 inches tall. Some people will be 6 feet tall while others will be 5 feet 6 inches tall. The average of a set of a values only gives us a general idea of the group as a whole and does not tell us about any individual in the group. In the same way, the atoms in a material are all moving at different speeds and with different energies, even when the material has a constant and uniform temperature. Some of the atoms are moving faster than the speed corresponding to the material's temperature and some of the atoms are moving slower. A few of the atoms are moving much faster than what is implied by the temperature.

Hello candidate,

Chemistry in everyday life, polymers, and biomolecules are most important for the JEE Mains examination and the syllabus for from this chapter does not come very frequently in the JEE advanced examination. So, it's better that you focus on the JEE Mains examination perspective in order for preparing for the chapters people in depth question from the chapter are not expected very often as per previous year trends. So, NCERT class 11th and class 12th text books would be enough for solving most of the questio in previous year paper from these chapters.

Good Luck!!

Hey student,

9 How many hydrogen bonded water molecules are associated in CuSO4. 5H2O ? Solution Only one water molecule, which is outside the coordination sphere, is hydrogen bonded. The other four molecules of water are coordinated with copper cation.

All the best student,

Hope this helps you.

Hi

A Molecule of a substance is defined as the smallest possible unit of a substance having all the physical and chemical properties of the substance. It is usually formed by two or more atoms coming togather to form a smallest identifiable unit

This molecule are formed when atoms come together to form chemical bonds which are generally formed by sharing or donating electrons between the atoms. There are different types of bondings like

Ionic

Covalent

Hydrogen bonds

Van der walls interactions

Hope this helps

hello Zarikul hoque,

hope you are doing well now coming back to your question,

As we know that in general, a non-linear molecule with N atoms has 3N – 6 normal modes of vibration, but a linear molecule has 3N – 5 modes, because rotation about the molecular axis cannot be observed. A diatomic molecule has one normal mode of vibration, since it can only stretch or compress the single bond.

hope this will help you lot,

Thank you.

hello rohit

As we know that for a molecule, molecular weight in grams is equal to the Avogadro number and for transforming between moles and grams, we could use the molar mass of the substance. Avogadro’s number can be expressed as the number of elementary particles such as molecules, atoms, compounds, etc. per mole of a substance and Avogadro number is often denoted as NA.

18 mole of water will contain 18×6.023×1023 number of molecules.

therefore the number of water molecules is maximum in 18 moles of water.

hope this will help you a  lot.

thank you.

For previous year jee main questions along with answers you can visit the below link-

https://engineering.careers360.com/download/jee-main-sample-papers-previous-years

Here you will be able to download the question paper along with the answer key/scheme for free in a pdf format.You can practice these papers and find questions related to bio molecules from them.