Acompound contains only carbon, hydrogen, nitrogen, and oxygen. combustion of 0.157 g of the compound produced 0.213 g of co2 and 0.0310 g of h2o. in an- other experiment, 0.103 g of the compound produced 0.0230 g of nh3. what is the empirical formula of the compound? hint: combustion involves reacting with ex- cess o2. assume that all the carbon ends up in co2 and all the hydrogen ends up in h2o. also assume that all the nitrogen ends up in the nh3 in the second experiment.

What happens when an acid dissolves?

Astudent is given a sample of a blue copper sulfate hydrate. he weighs the sample in a dry covered porcelain crucible and got a mass of 23.875 g for the crucible, lid, and sample. the mass of the empty crucible and lid was found earlier to be 22.652 g. he then heats the crucible to expel the water of hydration, keeping the crucible at red heat for 10 minutes with the lid slightly ajar. on colling, he finds the mass of crucible, lid, and contents to be 23.403 g. the sample was changed in the process to very light clue anhydrous cuso4. if there are again 100.0 g of hydrate, how many grams of cuso4 are in it? how many moles of cuso4? (hint: molar mass of cuso4 = 159.6 g / mole. what per cent of the hydrate is cuso4? you may convert the mass of cuso4 to moles.)

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?