3 years ago

......... ..plz hep????

Chemistry

1 answer:

likoan [24]3 years ago

6 0

I’m positive it’s gonna be c

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What is the correct formula for calcium nitride

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Ca3N2 is your answer<span> </span>

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What is the energy in joules of one photon of<br> microwaveradiation with a wavelength 0.122m?

pentagon [3]

<u>Answer:</u> The energy of photon is $162.93\times 10^{-26}J$

<u>Explanation:</u>

The relation between energy and wavelength of light is given by Planck's equation, which is:

$E=\frac{hc}{\lambda}$

where,

E = energy of the light = ?

h = Planck's constant = $6.626\times 10^{-34}Js$

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Putting values in above equation, we get:

$E=\frac{(6.626\times 10^{-34}Js)\times (3\times 10^8m/s)}{0.122m}\\\\E=162.93\times 10^{-26}J$

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3 years ago

Which of the following instruments is a combination of a percussion and a stringed instrument?

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3 years ago

Chemistry

postnew [5]

There are 48.72 g Fluorine ions

<h3>Further explanation </h3>

Proust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements

In the same compound, although from different sources and formed by different processes, it will still have the same composition/comparison

%F in CaF₂ :

$\tt \%F=\dfrac{2.Ar~F}{MW~CaF_2}\times 100\%\\\\\%F=\dfrac{2.19}{78}\times 100\5=48.72\%$

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$\tt 48.72\%\times 200=97.44~g$

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$\tt =\dfrac{97.44}{2}=48.72~g$

7 0

2 years ago

......... ..plz hep???? ​

......... ..plz hep????