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2 years ago

2Al + 3O2 ➞ 2Al2O3 balance or not?

Physics

1 answer:

Viktor [21]2 years ago

7 0

Answer:

The correct balanced equation is: 4Al + 3O₂ ➞ 2Al₂O₃

Explanation:

Unfortunately, that isn't the balanced equation. If you take the original equation [unbalanced],

Al + O₂ ➞ Al₂O₃

We have 1 aluminium and 2 oxygen on the left-hand side. On the right-hand side, we have 2 aluminium and 3 oxygen. So we must add 3 on the oxygen in the left-hand side and 2 on the aluminium oxide in the right-hand side.

Al + 3O₂ ➞ 2Al₂O₃

Now if you check, we have 1 aluminium and 6 oxygen on the left-hand side and 4 aluminium and 6 oxygen on the right-hand side. The number of moles of oxygen is equal but the number of moles of aluminium isn't. So we must add 4 on the aluminium of the left-hand, in order to have a balanced equation.

4Al + 3O₂ ➞ 2Al₂O₃

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3 years ago

A 0.311 kg tennis racket moving 30.3 m/s east makes an elastic collision with a 0.0570 kg ball moving 19.2 m/s west. Find the ve

amm1812

Answer:

The velocity of the tennis racket after the collision 14.966 m/s.

Step-by-step explanation:

let the following:

m₁ = mass of tennis racket = 0.311 kg

m₂ = mass of the ball = 0.057 kg

u₁ = velocity of tennis racket before collision = 30.3 m/s

u₂ = velocity of the ball before collision = -19.2 m/s

v₁ = velocity of tennis racket after collision

v₂ = velocity of the ball after collision

Right (+) , Left (-)

An elastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies remains the same.

So, the total kinetic energy before collision = the total kinetic energy after collision.

So, 0.5 m₁ u₁² + 0.5 m₂ u₂² = 0.5 m₁ v₁² + 0.5 m₂ v₂² ⇒ (1)

Also, the total momentum before collision = the total momentum after collision.

So, m₁ u₁ + m₂ u₂ = m₁ v₁ + m₂ v₂ ⇒ (2)

Solving (1) and (2):

∴ v₁ = [ u₁ * (m₁ - m₂) + u₂ * 2m₂ ]/ (m₁ + m₂)

= ( 30.3 * (0.311 - 0.057) - 19.2 * 2 * 0.057 ) / ( 0.311 + 0.057)

= 14.966 m/s.

So, the velocity of the tennis racket after the collision 14.966 m/s.

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4 years ago

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Answer:

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