NCERT Class-9 Science Solutions: Chapter 3-Atoms and Molecules Part 9 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 36:

Compute the difference in masses of moles each of magnesium atoms and magnesium ions.

Answer:

Magnesium Atoms and Magnesium Ions

A ion and atom different by two electrons. moles of and Mg atoms would different by moles of electrons

Question 37:

Which has more number of atoms?

Answer:

Question 38:

Compute the number of ions present in of sodium chloride.

Answer:

or moles of particle

Each particle is equivalent to one and one

Total moles of ions

No. of ions

Question 39:

A gold sample contains 90 % of gold and the rest copper. How many atoms of gold are present in one gram of this sample of gold?

Answer: