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CompoundScientists use the relative atomic mass scale to compare themasses of different atoms of elements. Atoms of carbon-12isotopes are assigned a relative atomic mass of 12 and therelative masses of all other atoms are obtained by comparisonwith the mass of a carbon-12 atom.The Avogadro constant 6.022 x 1023 is defined as the numberof atoms in exactly 12 g of carbon-12.The mole is the amount of substance that contains the samenumber of particles (atoms/ ions/ molecules/ formula unitsetc.) as there are atoms in exactly 12 g of carbon-12.Mass of 1 mole of a substance is called its molar mass.xercisesA 0.24 g sample of compound of oxygen and boron was foundby analysis to contain 0.096 g of boron and 0.144 g of oxygen.Calculate the percentage composition of the compound byweight. |
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