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zalisa [80]
3 years ago
5

What is the frequency of light that has awavelength of 244 pm?​

Chemistry
1 answer:
dimulka [17.4K]3 years ago
7 0

Answer:

f =  0.0123 × 10²⁰ s⁻¹

Explanation:

Given data:

Wavelength = 244 pm

Frequency = ?

Solution:

First of all we will convert the pm into meter.

244 pm. 1 m / 10¹² pm =  244× 10⁻¹² m

Formula:

f = c/ λ

f = frequency

c = speed of light

λ = wavelength

Now we will put the values in formula.

f = c/ λ

f = 3 × 10⁸ m.s⁻¹ / 244× 10⁻¹² m

f =  0.0123 × 10²⁰ s⁻¹

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How much aluminum oxide are produced when 46.5g of Al react with 165.37g of MnO?
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<h3>Further explanation</h3>

Given

46.5g of Al

165.37g of MnO

Required

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Solution

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mol = mass : Ar

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mol = 1.722

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mol = 2.329

mol : coefficient ratio Al : MnO = 1.722/2 : 2.329/3 = 0.861 : 0.776

MnO as a limiting reactant(smaller ratio)

So mol Al₂O₃ based on MnO as a limiting reactant

From equation , mol Al₂O₃ :

= 1/3 x mol MnO

= 1/3 x 2.329

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= 0.776 x 102

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3 years ago
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andrey2020 [161]

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Explanation:

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