To answer this question, we can use the following equation:
where e is the energy change, h is Planck's constant, c is the speed of light (m/s), and lambda is wavelength in meters. So then we can plug in the information:
So the energy that is omitted by the atom is 
.
To complete the balancing of the following combustion reaction, we must do elemental balances. For C, there is 5 on the left side hence there should be 5 CO2. For H, H20 should be 9/2. Next we balance O. on theright side we find a total of 29/2. So the o2 on the left side should be 29/4. To have whole number stoich.coeff. we multiply the numbers by 4, hence answer is
4C5H9O + 9O2= 20 O2 + 18 H20.
I don't know which ones r, could u add options, maybe?
The addition of hydrofluoric acid and Naf( answer c) to water produces a buffer solution.
Naf is used because buffer consist of a weak acid and the salt of that base.Buffer also consist a weak base and salt of that base .Hydrofluoric acid is a weak acid thus the salt would be added is Naf to produce buffer solution.
