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Assoli18 [71]
3 years ago
5

12. What is the frequency of a photon with an energy of 3.03 x 10-19 J?

Chemistry
1 answer:
bazaltina [42]3 years ago
5 0

Answer:

u=4.57x10^5GHz

Explanation:

Hello.

In this case, given the formula:

E=h*u

Whereas E is the energy, h the Planck's constant and u the frequency of the photon. Thus, solving for it, we obtain:

u=\frac{E}{h}=\frac{3.03x10^{-19}J}{6.63x10^{-34}J*s}\\  \\u=4.57x10^{14}s^{-1}

Or also:

u=4.57x10^{14}Hz*\frac{1GHz}{1x10^9Hz}\\ \\u=4.57x10^5GHz

Best regards.

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8 0
1 year ago
What mass of F2 is needed to produce 180 g of PF3 if the reaction has a 78.1% yield?
nexus9112 [7]

Answer:

91.26 g

Explanation:

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Mass of PF₃ = 180 g

Mass of F₂ required = ?

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Chemical equation:

P₄ + 6F₂   → 4PF₃

Moles of PF₃:

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Number of moles = 2.05 mol

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                        PF₃            :           F₂

                          4               :           6

                          2.05         :           6/4×2.05 = 3.075

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