An Ally of magnesium contains 80% of aluminium and rest magnesium.
How many atoms of aluminium are present in 1 gram of sample of magnesium ?
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The key to this problem is the correct interpretation of what atomic weight means.
Notice that aluminium is said to have an atomic mass of
26.982 u
The unit used here is the unified atomic mass unit,
The unified atomic mass unit is defined as of the mass of a neutral carbon-12 atom and is approximately equal to the mass of one nucleon, as in the mass of one proton or one neutron.
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Answer:
1.204×1024atoms of magnesium are present ... Convert mass of Mg to moles of Mg using the molar mass of Mg as a conversion ... 48.60g ×1mol24.31g = 2.00mol.
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