A flask with a total volume of 0.250L is found to contain 0.5445g of an unknown gas when the pressure and temperature are 0.790 atm and 108 . C. respectively, What is the molecular weight of the unknown gas? amu How many grams of calcium carbonate are needed to produce 4.08L of carbon dioxide according to the following reaction at 25C and 1 atm? calcium carbonate (s) calcium oxide (s)+ carbon dioxide (g) 9 calcium carbonate Hydrogen gas is produced by the reaction of hydrochloric acld, HC, on zinc metal. 2HCr(aq)+Zn(s)+ZnCl2(aq)+H2(g) The gas is collected over water. If 155mL of gas is collected at 19C and 769mmHg total pressure, what is the mass of hydrogen collected? The vapor pressure of H2O at 19C is 16.5mmHg. An experiment calls for 3.00 mol of chlarine, Cl2. What volume will this be if the gas volume is measured at 39C and 4.20 atm? Volume = 2 then atthmpts rethalning