Question

. One mole of sodium atoms contain____________gram mass.
TRUE/FALSE
1. The concept of mole applicable only for atoms. T/F
2. Number of moles of any atom depends on its valenva T/F
Answer the following questions:
● What do you mean by Mole concept?Give an example.
● What do you mean by Avogadro numbers ?Give an example.
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Answer 1

Answer:

If we know the mass of 1 mole of Na, and how many atoms are in a mole, the mass of a single atom should be easy to obtain: mass Na atom = 22.99 g Na/mole x 1 mole/6.023 x 1023 atoms = 3.817 x 10-23 g.

1. false
2. true

• The identity of a substance is defined not only by the types of atoms or ions it contains, but by the quantity of each type of atom or ion. For example, water, H2O, and hydrogen peroxide, H2O2, are alike in that their respective molecules are composed of hydrogen and oxygen atoms.
• Avogadro's number is an absolute number: there are 6.022×1023 elementary entities in 1 mole. This can also be written as 6.022×1023 mol-1. ... For example, the mean molecular weight of water is 18.015 atomic mass units (amu), so one mole of water weight 18.015 grams.

Answer 2

Answer:

one mole of sodium contain 22.98g

1-false

2-false

*The mole is teh amount of a substance which contains many particles(atoms/ions/molecules/formula units)..as in 12g of C-12.Thus,one mole of any species is taht quantity in number having a mass equal to it's atomic mass in grams..

example= 1 mole carbon (C, atomic mass=12)is equal to 12g..

*The number of particles present in 1 mole of any substance is same and fixed ,which is equal to 6.022×10*23..

This a constant known as avogandro constant or Avogandro number(Na) ....

Thus mole is also defined as number of particles equal to the Avogandro constant,Na(6.022×10*23)..