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4(a)- The mole is the unit of measurement for amount of substance in the International System of Units. A mole of a substance or a mole of particles is defined as exactly 6.02214076×10²³ particles, which may be atoms, molecules, ions, or electrons. In short, for particles 1 mol = 6.02214076×10
(b)- Therefore 34 g of NH₃ contains 12.044*10²³ molecules.
(c)- This answer is at the above image.
5- The colloidal particle absorbs the energy of incident light and then scatter a part of this energy from their surfaces. Thus tyndall effect is due to scattering of light by the colloidal particles.
It is caused by reflection of the incident radiation from the surfaces of the particles, reflection from the interior walls of the particles, and refraction and diffraction of the radiation as it passes through the particles. Other eponyms include Tyndall beam (the light scattered by colloidal particles).
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