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2 years ago

How many particles would be found in a 89.2 g sample of Na?

1 answer:

5 0

One mole of a substance contains 6.02 × 10∧23 particles. Thus we first convert 89.2 g to moles. 1 mole of sodium contains 23 g
Hence 89.2 g = 89.2 / 23 g = 3.878 moles
Therefore, 3.878 × 6.02×10∧23 particles= 23.346 × 10∧23 particles
Hence 89.2 g of sodium contains 2.335 ×10∧24 particles

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A balloon is filled with 35.0 L of helium in the morning when the temperature is 303 degrees kelvin. By 3:00 p.m., the temperatu

Anna007 [38]

Answer:

The new volume of the balloon is 38.5 L

Explanation:

Step 1: Data given

Volume at the start = V1 = 35.0 L

Temperature at the start = T1 = 303 Kelvin

Volume by 3pm = TO BE DETERMINED

Temperature by 3pm = 333 Kelvin

<u>Step 2: </u>Calculate the new volume

Charles' gas law says

V1/T1 = V2/T2

V 1 is the initial volume and T1 is the initial temperature

V2 is the final volume and T2 is the final temperature

35 L / 303 Kelvin = V2 / 333 Kelvin

V2 = 35L * 333 Kelvin / 303 Kelvin

V2 = 38.47L ≈ 38.5 L

The new volume of the balloon is 38.5 L

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3 years ago

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Answer:

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Explanation:

$density = \frac{m}{v}$

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3 years ago

At what point on the hill will the car have zero gravitational potential energy? A) Half-way down the hill. B) At the top of the

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I think it’s c cause height is what determines gravitational potential energy

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According to the rate law (rate = k[a]m[b]n), what does the rate of a reaction depend on?

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Concentration of the reactant,pressure,surface
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3 years ago

A sample of oxide iron weighing 2.40g was heated in a stream of hydrogen until it was completely converted to the metal. If the

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Answer:

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Explanation:

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<em>Moles Fe:</em>

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