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11 April, 10:11

A brick has a mass of 4.0kg and the earth has a mass of 6.0*10^27g.

be sure your answers have the correct number of significant digits.

what is the mass of 1 mole of bricks?

how many moles of bricks have a mass equal to the mass of the earth? write answer as a decimal to one decimal place.

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  1. 11 April, 11:05
    0
    Mass of 1mole of brick = mass of 1 brick x avagadro number

    = 4 kg x 6.022 x 10^23 bricks = 2.4 x 10^24 kg

    No. of moles of bricks have a mass equal to the mass of the earth

    = mass of earth / mass of 1 mole of brick

    = [ 6 x 10^27 ] / [ 2.4 x 10^24 ]

    = 2.5 x 10^3

    = 2500 moles
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