1. One of the electron transitions in a hydrogen atom produces infrared light with a wavelength of 7.464 x 10 -6 m. What amount of energy causes this transition? 2. Find the energy in kJ for an x-ray photon with a frequency of 2.4 x 1018 1/s.

3. A ruby laser produces a red light that has a wavelength of 500nm. Calculate its energy in joules.

4. What is the wavelength and frequency of a photon with an energy of 1.4 x 10-21J?

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2

c

explanation:

the answer is yes

it has kinetic energy

reason

an object has kinetic energy when you stop the force carrying it, the object will stay in motion.

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