Can someone help me Balance chemical equations please

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

If 90.0 grams of ethane reacted with excess chlorine, how many grams of dicarbon hexachloride would form

High-pressure liquid chromatography (hplc) is a method used in chemistry and biochemistry to purify chemical substances. the pressures used in this procedure range from around 500 kilopascals (500,000 pa) to about 60,000 kpa (60,000,000 pa). it is often convenient to know the pressure in torr. if an hplc procedure is running at a pressure of 1.03×108 pa , what is its running pressure in torr?