A 0.784 g sample of magnesium is added to a 250 ml flask and dissolved in 150 ml of water. magnesium hydroxide obtained from the

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D.) Gas X possesses a lower density and effuses more quickly than Gas Y. Explanation: Gas X has a lower molar mass compared to Gas Y, and the density of a gas is directly proportional to its molar mass. Therefore, it has a lower density than Gas Y. Thomas Graham discovered that, under constant temperature and pressure, the effusion rates of various gases are inversely related to the square root of their molar masses (M). Consequently, a gas with a lower molar mass will effuse faster than one with a higher molar mass. Thus, Gas X effuses faster than Gas Y. So, the correct selection is: D.) Gas X has a lower density and effuses faster than Gas Y.

The thickness of the metal sheet measures 1.93 mm.