Answer : The energy of photon = ![21.369\times 10^{-19}J](https://tex.z-dn.net/?f=21.369%5Ctimes%2010%5E%7B-19%7DJ)
Solution : Given,
Final energy level = 1
Initial energy level = 7
Formula used :
..........(1)
where,
= wavelength
R = Rydberg's constant = 1.0974 ![\times 10^7m^{-1}](https://tex.z-dn.net/?f=%5Ctimes%2010%5E7m%5E%7B-1%7D)
= final energy level
= initial energy level
Now put all the given values in above formula (1), we get the value of wavelength.
= ![1.0750\times 10^7m^{-1}](https://tex.z-dn.net/?f=1.0750%5Ctimes%2010%5E7m%5E%7B-1%7D)
![\lambda=0.9302\times 10^{-7}m](https://tex.z-dn.net/?f=%5Clambda%3D0.9302%5Ctimes%2010%5E%7B-7%7Dm)
Now we have to calculate the energy of photon by using formula,
![E=\frac{h\times c}{\lambda}](https://tex.z-dn.net/?f=E%3D%5Cfrac%7Bh%5Ctimes%20c%7D%7B%5Clambda%7D)
where,
E = energy
h = planck's constant = ![6.626\times 10^{-7}Js](https://tex.z-dn.net/?f=6.626%5Ctimes%2010%5E%7B-7%7DJs)
c = speed of light = ![3\times 10^8m/s](https://tex.z-dn.net/?f=3%5Ctimes%2010%5E8m%2Fs)
= wavelength
put all the values in this formula, we get the energy of photon.
= ![21.369\times 10^{-19}J](https://tex.z-dn.net/?f=21.369%5Ctimes%2010%5E%7B-19%7DJ)
Answer:
Mass = 473.2 g
Explanation:
Given data:
Mass of cobalt(III) nitrate = 206 g
Mass of silver bromide produced = ?
Solution:
Chemical equation:
CoBr₃ + 3AgNO₃ → 3AgBr + Co(NO₃)₃
Number of moles of cobalt(III) nitrate:
Number of moles = mass/ molar mass
Number of moles = 206 g/ 245 g/mol
Number of moles = 0.84 mol
Now we will compare the moles of cobalt(III) nitrate with silver bromide.
Co(NO₃)₃ : AgBr
1 : 3
0.84 : 3/1 × 0.84 = 2.52 mol
Mass of silver bromide:
Mass = number of moles × molar mass
Mass = 2.52 mol × 187.77 g/mol
Mass = 473.2 g
Answer:
7.941
Explanation:
You can look at a picture of the periodic table.To calculate the atomic mass of a single atom of an element, add up the mass of protons and neutrons. Example: Find the atomic mass of an isotope of carbon that has 7 neutrons. You can see from the periodic table that carbon has an atomic number of 6, which is its number of protons.
Hope I helped
Answer:
sorry if this is wrong bt j would say rising sea levels