Question

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Answer 1

Answer:

8

3×10 = 3×10×10× 10×10×10×10×10 =

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Answer 2

Answer:

4. Electromagnetic radiation with a wavelength of 589 nm appears as yellow light to the human eye. The energy of one photon of this light is 3.37x10^-19J.

5. Given Urea= NH2- CO- NH2

And we know that Total mass of urea = 60 Mass of nitrogen = 14

Two molecules of nitrogen= 2*14= 28

Percentage of nitrogen = Mass of Nitrogen/(Urea ) x 100 = 28/60 x 100 = 46.6%

Hence Percentage of nitrogen in urea is 46.6%

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