How Can You Determine the Atomic Mass of an Unknown Metal If You Exercise Chapter 1 the Solid State Chemistry Class

How can you determine the atomic mass of an unknown metal if you know its density Chapter 1: the Solid State Chemistry Class 12 solutions are developed for assisting understudies with working on their score and increase knowledge of the subjects. Question 5. How can you determine the atomic mass of an unknown metal if you know its density? is solved by our expert teachers. You can get ncert solutions and notes for class 12 chapter 1 absolutely free. NCERT Solutions for class 12 Chemistry Chapter 1: the Solid State is very essencial for getting good marks in CBSE Board examinations

Question 5. How can you determine the atomic mass of an unknown metal if you know its density?
Answer:
Let consider a cubic crystal:
Let take volume of a unit cell = a³
Number of atoms in unit cell = z
Mass of each single atom = m
Molar mass of metal =M
Avogadro number =N_A
Use formula
Mass of the unit cell = number of atoms in unit cell × mass of each atom = z × m …(1)
Mass of each atom(m) = Molar mass / Avogadro number
Plug the value of m in equation (1) we get
Mass of unit cell =zM /N_A … (2)
Density of the unit cell = mass of unit cell / volume of unit cell

Using above formula we can calculate the atomic mass of unknown metal

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