The red line of the hydrogen emission spectrum has a wavelength of 656.1 nm. calculate the energy of one photon

We just started a new lesson in chemistry and everyone hates it and i dont get it one bit. i hate school. h el p.balanced equationc3h8+5o2-> 3co2+4h2o1.) if you start with 14.8g of propane(c3h8) and 3.44g of oxygen, which is the limiting reactant -check my answer 2.)what mass of excess reagent is left over? 3.)what mass of carbon dioxide can be made? 4.)what mass of water is produced?

List four observations that indicate that a chemical reaction may be taking place

Is powdered sports drink ionic or covalent ? 10pts !