Question

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.

Answer 1

Mass of 1 mole of brick is $\rm 2.4\;\times\;10^2^4$ kg. 2500 moles of brick will weigh the same as the mass of the earth.

(a) Mass of 1 mole of bricks:

Mass of 1 mole = weight $\times$ Avagadro number

Mass of 1 mole brick = 4.0 $\times\;6.023\;\times\;10^2^3$

Mass of 1 mole of brick is $\rm 2.4\;\times\;10^2^4$ kg.

(b) Number of moles of bricks having mass equal to earth:

= $\rm \dfrac{mass\;of\;earth}{mass\;of\;1\;mole\;of\;brick}$

= $\rm \dfrac{6.0\;\times\;10^2^7}{2.4\;\times\;10^2^4}$

= 2.5 $\rm \times\;10^3$ moles

= 2500 moles of brick will weigh the same as the mass of the earth.

For more information, refer to the link:

https://brainly.com/question/20486415

Answer 2

To have the mass equal to that of earth, the required number of moles of bricks are $2.5 \times 10^{3} \;\rm moles$.

Given data:

The mass of brick is, m = 4.0 kg.

The mass of Earth is, $M=6.0 \times 10^{27} \;\rm kg$.

Number of moles of brick is, n = 1.

(a)

The mass of 1 mole of bricks is,

$m'= \rm m \rm \times Avogadro \;Number\\m'= 4.0 \rm \times 6.023 \times 10^{23}\\m' =2.4 \times 10^{24} \;\rm kg$

Thus, the mass of 1 mole of bricks is  $2.4 \times 10^{24} \;\rm kg$.

(b)

The number of moles (N) of brick to have mass equal to the mass of the earth is expressed as,

$N=\dfrac{M}{m'} \\\\N=\dfrac{6.0 \times 10^{27}}{2.4 \times 10^{24}} \\\\N=2.5 \times 10^{3} \;\rm moles$

Thus, for having the mass equal to the mass of the earth, the brick should have $2.5 \times 10^{3}$ number of moles.

Learn more about the mole concept here:

https://brainly.com/question/20483253