Aphoton has a wavelength of 705nm calculate the energy of the photon in joules

The energy of the photon is

Explanation:

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

where,

E = energy of the photon

h = Planck's constant  =

c = speed of light  =

= wavelength of photon  = 705 nm =     (Conversion factor:   )

Putting values in above equation, we get:

Hence, the energy of the photon is

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :