Calculate the energy of quantum of radiant energy with a frequency of 5.00 x 10^11/s. show your work.

Calculate the energy of quantum of radiant energy with a frequency of 5.00 x 10^11/s. this can be solved using Planck-Einstein Equation

E = hf

Also known as Planck's Relation, the energy of a photon is given by:

 , where:

E = Energy (J)

h = Planck's Constant (J*s) = 6.626070040×10−34 Js

f = Frequency (Hz) = 5.00 x 10^11/s

E= 3.31x10^-22 j

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)