Chemistry
(a) The relative atomic mass of Cl atom is 35.5 a.m.u. Explain this statement.
(b) What is the value of Avogadro's number ?
(c) What is the value of molar volume of a gas at S.T.P.?
Mole Concept
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Answer
(a) The relative atomic masses of any element is the weighted average of the relative atomic masses of it's natural isotopes. Chlorine consists of a mixture of two isotopes of masses 35 and 37 in the ratio 3 : 1.
The average relative atomic mass of Cl = = 35.5
(b) 6.022 × 1023
(c) The molar volume of a gas is 22.4 dm3 (litre) or 22400 cm3 (ml) at S.T.P.
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