Question

compound
Scientists use the relative atomic mass scale to compare the
masses of different atoms of elements. Atoms of carbon-12
isotopes are assigned a relative atomic mass of 12 and the
relative masses of all other atoms are obtained by comparison
with the mass of a carbon-12 atom.
The Avogadro constant 6.022 x 1023 is defined as the number
of atoms in exactly 12 g of carbon-12.
The mole is the amount of substance that contains the same
number of particles (atoms/ ions/ molecules/ formula units
etc.) as there are atoms in exactly 12 g of carbon-12.
Mass of 1 mole of a substance is called its molar mass.
xercises
A 0.24 g sample of compound of oxygen and boron was found
by analysis to contain 0.096 g of boron and 0.144 g of oxygen.
Calculate the percentage composition of the compound by
weight.​

Answer 1

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