An alloy contains 97% by mass aluminium and 3% by mass copper. 8. Using 100 kg of...

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Chemistry

An alloy contains 97% by mass aluminium and 3% by masscopper.
8. Using 100 kg of material as the starting point, whatproportion of the atoms are copper?

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3.6 Ratings (642 Votes)

An alloy contains 97% by mass aluminium and 3% by mass copper.

100 Kg of material containing copper = 100*(3/100)

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 3 Kg of copper

moles of copper = mass/molarmass

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 3000/63.55

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 47.21 moles

1 mole of copper contains -----> 6.023*10^23 atoms of copper

47.21 moles of copper contains ------> (6.023*10^23*47.21)

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 2.84*10^25 atoms of copper

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