Question

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

Answer 1

The mass of 1 mole of bricks is about 2.4 × 10²⁴ kg

2500 moles of bricks have a mass equal to the mass of the earth

Further explanation

This problem is about mole.

1 mole ≈ 6.0 × 10²³ particles

1 mole of bricks ≈ 6.0 × 10²³ bricks

Mass of 1 brick = 4.0 kg

Mass of 1 mole of bricks ≈ 6.0 × 10²³ × 4 kg = 2.4 × 10²⁴ kg

Number of moles of bricks that have a mass equal to the mass of the earth could be calculated as follows.

n = Mass of the Earth ÷ Mass of 1 mole of bricks

n = (6.0 × 10²⁷) ÷ (2.4 × 10²⁴)

n = 2500

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Answer details

Grade: High School

Subject: Physics

Chapter: Physical Quantities

Keywords: Velocity , Driver , Car , Deceleration , Acceleration , Obstacle , Speed , Time , Rate , Length , Mass , Physical , Quantities , Conversion , Unit , cg , mg , kg

Answer 2

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