Magnesium can be used as a “getter” in evacuated enclosuresto react with the last traces of oxygen. (The magnesium isusually heated by passing an electric current through a wireor ribbon of the metal.) If an enclosure of 0.452 L has a partialpressure of O2 of 3.5 x 10-6 torr at 27 °C, what mass of magnesiumwill react according to the following equation?2 Mg(s) + O2(g)------>2 MgO(s)

5. A homeowner uses 4.00 x 10³ m³ of natural gas in a year to heat a home. Assume that natural gas is 100% methane, CH4, and that methane is behaving as a perfect gas, in this scenario. What is the mass of gas used? (Assume 1.00 atm pressure and 20°C)

2. A sample of gas was contained in a 245 mL flask at a temperature of 23.5 °C and the pressure was found to be 48.5 mm Hg. The gas was immersed into a cold flask with a volume of 68 mL. What is the pressure of the gas in the smaller flask at a 19 °C temperature.

Sometimes in lab we collect the gas formed by a chemical reaction over water (see sketch at right). This makes it easy to isolate and measure the amount of gas produced. 2 Suppose the CO₂ gas evolved by a certain chemical reaction taking place at 40.0 °C is collected over water, using an apparatus something like that in the sketch, and the final volume of gas in the collection tube is measured to be 51.0 mL. g x10 X 歐 Sketch of a gas-collection apparatus S collected gas Calculate the mass of CO₂ that is in the collection tube. Round your answer to 2 significant digits. You can make any normal and reasonable assumption about 2 the reaction conditions and the nature of the gases. water chemical reaction

An ideal gas in a sealed container has an initial volume of 2.35 L. At constant pressure, it is cooled to 17.00 ∘C, where its final volume is 1.75 L. What was the initial temperature?T1=?

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