A student expels .14 grams of butane and collects 62.4 ml of it by bubbling it through water at 20.0 C. The barometric pressure is .96 atm. What is the experimental formula weight of the butane gas?

Amass of 100.0 g of solute is dissolved in water so that 850. ml of a 0.7500 m solution has been prepared. what is the molar mass of the solute?

Esign techniques and materials that reduce the negative environmental impact of a structure are referred to as

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?