# Formulas

### Equations

• Energy of an electron in a Hydrogen like atom
E = –$\frac{2\pi^2me^4Z^2}{n^2h^2}$
• Wavelength of an electron – From DeBroglie’s Equation
$\lambda =\frac{h}{mv}$ or $\lambda =\frac{h}{p}$ where p is the momentum of the particle
• Concentration of a solution C expressed in molarity can be calculated using the formula $C=\frac{n}{V}$
• The number of moles in a given quantity expressed in grams can be calculated using the following formula $n=\frac{m}{Mm}$ Where ‘m’ is the mass of the substance in grams and Mm is the molar mass of the substance in grams/mole

### Equations used in the different topics for highs school students

[wpcuebasicquiz 935]

[QTL-Quiz id=7]