Question -
What do you understand by Mole? If 8.4 g X element includes 9.03×1022 atoms and 0.1 mol X2Y3 compound is 16g, find atomic mass of Y element. (Avogadro number is 6.02×1023) [5 MARKS]
Answer: : Definition: 2 Marks Numerical: 3 Marks Onemoleis defined as the amount of substance containing as many elementary entities (atoms, molecules, ions, electrons, radicals, etc.) as there are atoms in 12 grams of carbon-12. The number of particles that is atoms, ions and molecules present in one mole of a substance is fixed with a value of 6.02×1023 molecules. Mole of X element is ; nx=(9.03×1023×(6.02×1023)=0.15mol Atomic mass of X; Ax=8.40.15=56g/mol Molar mass of X2Y3 compound; MX2Y3=160.1=160g/mol We find atomic mass of Y by; 2.X + 3Y =160 2.(56) + 3(Y)=160 Y=16g/mol is atomic mass of Y.
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