
PUMPA - SMART LEARNING
எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்
Book Free DemoBriefly answer the following question:
Compute the difference in masses of one mole each of aluminium atoms and one mole of its ions. (Mass of an electron is 9.1×10–28 g). Which one is heavier?
Mass of 1 mole of aluminium atom = the molar mass of aluminium = 27 g mol-1.
An aluminium atom needs to lose three electrons to become an ion, Al_3{^+}.
For one mole of Al_3{^+} ion, three moles of electrons are to be lost.
The mass of three moles of electrons = 3 × ( × 10^-{^2}{^8}) × 6.022 × 10^2{^3} g.
= × 6.022 × 10^-{^5} g.
= × 10^-{^5} g.
= 0.00164 g.
Molar mass of Al_3{^+} = (27 - 0.00164) g mol-1.
= g mol-1.
Difference = 27 - 26.9984
= g.