1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
love history [14]
3 years ago
10

For light with a wavelength of 12.5 nm, determine the energy of light in kJ/mol

Chemistry
1 answer:
vovikov84 [41]3 years ago
3 0
Energy is related to Wavelength as,

                                   E  =  h c / λ      --------  (1)
As,
       h  =  6.626 × 10⁻³⁴ Js
       c  =  2.99 × 10⁸ ms⁻¹
       λ  =  12.5 nm = 1.25 × 10⁻⁸ m

Putting values in eq. 1,

             E  =  (6.626 × 10⁻³⁴ Js × 2.99 × 10⁸ ms⁻¹) ÷ 1.25 × 10⁻⁸ m

             E  =  1.585 × 10⁻¹⁷ J

             E  =  1.585 × 10⁻²⁰ kJ × 6.022 × 10²³

             E  =  9544.87 Kj/mol
You might be interested in
Balanced or Unbalanced<br><br> CH4+4Ci2=CCi4+4HCi
Volgvan

Answer:

balanced

Explanation:

its balance since all the elments add up on both sides

7 0
3 years ago
Complete combustion of 7.40 g of a hydrocarbon produced 22.4 g of CO2 and 11.5 g of H2O. What is the empirical formula for the h
cluponka [151]
<span>C2H5 First, you need to figure out the relative ratios of moles of carbon and hydrogen. You do this by first looking up the atomic weight of carbon, hydrogen, and oxygen. Then you use those atomic weights to calculate the molar masses of H2O and CO2. Carbon = 12.0107 Hydrogen = 1.00794 Oxygen = 15.999 Molar mass of H2O = 2 * 1.00794 + 15.999 = 18.01488 Molar mass of CO2 = 12.0107 + 2 * 15.999 = 44.0087 Now using the calculated molar masses, determine how many moles of each product was generated. You do this by dividing the given mass by the molar mass. moles H2O = 11.5 g / 18.01488 g/mole = 0.638361 moles moles CO2 = 22.4 g / 44.0087 g/mole = 0.50899 moles The number of moles of carbon is the same as the number of moles of CO2 since there's just 1 carbon atom per CO2 molecule. Since there's 2 hydrogen atoms per molecule of H2O, you need to multiply the number of moles of H2O by 2 to get the number of moles of hydrogen. moles C = 0.50899 moles H = 0.638361 * 2 = 1.276722 We can double check our math by multiplying the calculated number of moles of carbon and hydrogen by their respective atomic weights and see if we get the original mass of the hydrocarbon. total mass = 0.50899 * 12.0107 + 1.276722 * 1.00794 = 7.400185 7.400185 is more than close enough to 7.40 given rounding errors, so the double check worked. Now to find the empirical formula we need to find a ratio of small integers that comes close to the ratio of moles of carbon and hydrogen. 0.50899 / 1.276722 = 0.398669 0.398669 is extremely close to 4/10, so let's reduce that ratio by dividing both top and bottom by 2 giving 2/5. Since the number of moles of carbon was on top, that ratio implies that the empirical formula for this unknown hydrocarbon is C2H5</span>
3 0
3 years ago
Wich of these equations are balanced? a) H2SO4+2AL---&gt;AL2(SO4) b)2KCL+Pb(NO3)2---&gt;2KNO3+PbCL2
Zolol [24]

The answer is b since on a it says H2 but on the right side there is no H idk if you forgot to put H there so im guessing b. Have a good day

4 0
2 years ago
\ helppppp
vazorg [7]

Answer:

characteristics i believe

8 0
2 years ago
Read 2 more answers
Consider the reaction 2CuCl2 + 4K - 2Cul + 4KCI + 12. If 4 moles of CuCl2 react with 4 moles of KI, what is the limiting reactan
Free_Kalibri [48]
Haha i’m trying to do the same one i’ll make sure if i find out how too to get back to you!
8 0
3 years ago
Other questions:
  • The isotope Np-238 has a half life of 2.0 days if 96 grams of it were present on Monday how much will remain six days later
    11·1 answer
  • Why do you think radioactive decay is measured in half lives, based on the characteristics of the graph.
    5·1 answer
  • Is it possible for the instantaneous speed to be greater than the average speed? Explain.
    5·1 answer
  • The volume of a gas is 18.6 L at 0.10 atm and 273 K. Calculate the pressure in
    8·1 answer
  • The starting position of this object is m. The object is traveling at a velocity of m/s.
    14·2 answers
  • Metal or Non-metal?
    11·1 answer
  • A student sets up a box with a flashlight that shines on a mirror located at position X. Other possible locations for objects in
    9·2 answers
  • Someone pls help me I will make you brain
    12·2 answers
  • Can anyone pls summarize this for me
    15·2 answers
  • You are trying to determine the
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!