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March 24, 2017

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How many Al atoms thick is the aluminum foil if it is 0.00157cm thick.

1 Al atom = 286pm

Convert pm to m
286pm = 2.86*10^-10m

Convert m to cm
2.86*10^-10m = 2.9*10^-8cm

Divide aluminum thickness and Al atom thickness
1.57*10^-3 / 2.9*10^-10 = 54138

So the aluminum foil is 54138 Al atoms thick?

Am I correct? If not please correct me!

Thank you very much.

  • Chemistry (URGENT) - ,

    1 Al atom = 286pm

    Convert pm to m
    286pm = 2.86*10^-10m

    agreed

    Convert cm to m
    0.00157 cm

    0.00157 cm/10^2 cm m^-1

    =0.0000157 m

    Divide aluminum thickness and Al atom thickness
    1.57*10^-5 m / 2.9*10^-10 m = 54138 atoms

    so looks OK. It is a good idea to keep units in calculations so you can make sure that the units cancel.

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