Question

A brick has a mass of and the Earth has a mass of . Use this information to answer the questions below. Be sure your answers have the correct number of significant digits. What is the mass of 1 mole of bricks? Round your answer to 2 significant digits. How many moles of bricks have a mass equal to the mass of the Earth? Round your answer to 2 significant digits.

Answer 1

The given question is incomplete. The complete question is:

A brick has a mass of 4.0 kg and the earth has a mass of $6.0\times 10^{27}g$ Use this information to answer the questions below. Be sure your answers have the correct number of significant digits. What is the mass of 1 mole of bricks? Round your answer to 2 significant digits. How many moles of bricks have a mass equal to the mass of the Earth? Round your answer to 2 significant digits.

Answer: The mass of 1 mole of bricks is $2.4\times 10^{27}g$

2.5 moles of bricks have a mass equal to the mass of the Earth

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number $6.023\times 10^{23}$ of particles.

Mass of 1 brick = 4.0 kg = 4000 g     (1kg=1000g)

Thus mass of 1 mole of brick or $6.023\times 10^{23}$ bricks will be = $\frac{4000g}{1}\times 6.023\times 10^{23}=2.4\times 10^{27}g$

The mass of 1 mole of bricks is $2.4\times 10^{27}g$

Now $2.4\times 10^{27}g$ will correspond to = 1 mole of bricks

$6.0\times 10^{27}g$ will correspond to =$\frac{1}{2.4\times 10^{27}}\times 6.0\times 10^{27}=2.5moles$

2.5 moles of bricks have a mass equal to the mass of the Earth