50 ml of a chlorofluorocarbon gas effused through a porous barrier in 157 seconds. the same volume of argon effused in 76 seconds under the same conditions. what is the formula of the chlorofluorocarbon?

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.