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charle [14.2K]
3 years ago
5

What is the percent mass of C8H10 when 123 g of C8H10 dissolved in 765 g of C6H6? Express your answer to three significant figur

es.
Chemistry
1 answer:
3241004551 [841]3 years ago
3 0

Answer:

13.8%

Explanation:

take the 123g and divide it by the total mass which is 123g + 765g

123/888 = .138

multiply by 100 for a percentage = 13.8%

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Determine the a) energy (in eV) and b) wavelength (in cm) corresponding to blue light of frequency 670 THz
Lesechka [4]

Answer :

(a) The energy of blue light (in eV) is 2.77 eV

(b) The wavelength of blue light is 4\times 10^{-5}cm

Explanation:

The relation between the energy and frequency is:  

Energy=h\times Frequency

where,

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Given :

Frequency = 670THz=670\times 10^{12}s^{-1}

Conversion used :

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So,  

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Energy=4.44\times 10^{-19}J

Also,  

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So,  

Energy=(4.44\times 10^{-19})\times (6.24\times 10^{18}eV)

Energy=2.77eV

The energy of blue light (in eV) is 2.77 eV

The relation between frequency and wavelength is shown below as:

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Where,

c = the speed of light = 3\times 10^8m/s

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So, Wavelength is:

670\times 10^{12}s^{-1}=\frac{3\times 10^8m/s}{Wavelength}

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Conversion used : 1m=100cm

The wavelength of blue light is 4\times 10^{-5}cm

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