Enter number on the left side; answer appears on the right side

This many:


To refresh your mind, here are the definitions of the units:

Unit Comments
Wavenumber(cm-1) A wavelength of energy that is also called a reciprocal centimeter. Wavenumbers are obtained when frequency is expressed in Hertz and the speed of light is expressed in cm/s. This unit is commonly used in infrared spectroscopy.
Kilojoules per mole (kJ/mol) A Joule, J, is the SI unit of energy and is defined as one kg.m2/s2. The prefix "kilo" means 1,000, so one kJ = 1,000 J. As the energies associated with a single molecule or atom are quite small, we often find it easier to discuss the energy found in one mole of the substance, hence "per mole". To get the energy for one molecule, divide kJ/mol by Avogadro's number, 6.022 x 1023.
Kilocalories per mole (kcal/mol) A calorie was originally defined as the amount of energy required to raise the temperature of one gram of water by one degree Celsius. One calorie = 4.184 J. One kcal = 1,000 cal.
Nanometer(nm) The prefix "nano" means 1 x 10-9 = 0.000000001 = 1/1,000,000,000. Therefore, a nanometer refers to energy with a wavelength that is 1/1,000,000,000th of a meter. Visible light is made up of electromagnetic radiation that has wavelengths ranging from roughly 400 to 800 nm.
Hertz (s-1, Hz) A Hertz is a unit of frequency defined as a reciprocal second, s-1. For example, AC current cycles polarity 60 times per second, so we could call this 60 Hz = 60 s-1. Human hearing has a frequency range from a few hundred Hz up to approximately 20,000 Hz.
The prefix "mega" means 1,000,000, so there are 1,000,000 Hz in one MHz. This is a typical frequency for radio equipment as well as high-tech scientific instruments such as magnetic resonance imaging (MRI, or NMR) scanners.
Electron Volt
The electron volt is the energy that we would give an electron if it were accelerated by a one volt potential difference. 1 eV = 1.602 x 10-19 J. This term is most often used by physicists and electrochemists.