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2 July, 08:47

If you stacked Avogadro's number of pennies one on top of the other on Earth's surface, how far would the stack extend (in km) ? [For comparison, the sun is about 150 million km from Earth and the nearest star (Proxima Centauri) is about 40 trillion km from Earth.]

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  1. 2 July, 10:32
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    the length of pennies will be like the Proxima Centauri

    Explanation:

    50 pennies make the length of a meter, so:

    50 pennies = 1 m

    x = 1 km

    x = (50 x 1000) = 50 000 pennies = 1 Km

    Then if the Avogadro's number is 6.022 x 1023 so:

    50 000 pennies = 1 km

    6.022 x 1023 pennies = x

    x = (6.022 x 1023 / 50 000) = 1.2044 x 1019

    This big number is closer to the 40 trillion km of the Proxima Centauri.

    Hope this answer is useful.
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