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e-lub [12.9K]
3 years ago
14

How much energy does a 930 nm wave of light have? (The speed of light in a

Chemistry
1 answer:
Orlov [11]3 years ago
4 0

Answer:

E=2.14\times 10^{-19}\ J

Explanation:

We have,

Wavelength of a light is 930 nm

It is required to find the energy of a wave of light. The energy of a wave is given in terms of following as :

E=\dfrac{hc}{\lambda}\\\\E=\dfrac{6.626\times 10^{-34}\times 3\times 10^8}{930\times 10^{-9}}\\\\E=2.14\times 10^{-19}\ J

So, the energy of the wave is 2.14\times 10^{-19}\ J

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6.5 Moles of Al reacts with 7.2 Moles of H2O What is the limiting reactant and calculate the Theoretical Yield?
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Answer:

H₂O is the limiting reactant

Theoretical yield of 240 g Al₂O₃ and 14 g H₂

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Find how many moles of one reactant is needed to completely react with the other.

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We need 9.75 mol of H₂O to completely react with 6.5 mol of Al.  But we only have 7.2 mol of H₂O.  Therefore, H₂O is the limiting reactant.

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Since the data was given to two significant figures, we must round our answer to two significant figures as well.

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