Where: E is the total energy in joules h is Planck's constant (6.626 x 10-34 J. s) c is the speed of the light (3.00 x 10% m/s) A is the wavelength (what are its units? how would you convert these units to nanometers?) Remember: 1m = 10°nm 1. Using the previous equations, calculate the energy (in joules) and the wavelength (in nanometers) when the electron changes from the initial to the final level of energy. *To input the energy, use the format xxxe-00. Initial level Final level Energy Wavelength 。 of energy of energy J var nm var 3 2 1 4 2 2 5 2 3 4 6 2 *** Score: 0/5 MacBook Air

question 21 only please

510. In an experiment, liquid heptane, C₂H₁6(1), is completely combusted to produce CO₂(g) and H₂O(1), as represented by the following equation. zemina inst C₂H₁6) + 11 O₂(g) →7 CO₂(g) + 8 H₂O(1) The heat of combustion, AH comb, for one mole of C₂H₁6() is -4.85 x 10³ kJ. Determine the enthalpy of formation, AHºf, for C₂H16(1)

What is the standard heat of formation of C2H4 H2+1/2O2>H2O.   -242kj/mol 2C+3H2+1/2O2>C2H5OH. -273kj/mol C2H4+H20>C2H5OH.    -88kj/mol 2C+2H2>C2H4

2H9O (s) 2Hg (s) + 02 (g) O synthesis O decomposition O hydrocarbon combustion O single replacement O double replacement