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sargun
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Three gases (8.00 g of methane, CH4, 18.0 g of ethane, C2H6, and an unknown amount of propane, C3H8) were added to the same
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A cylinder with a movable piston contains 2.00 g of helium, He, at room temperature. More helium was added to the cylinder and
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Calculate the standard enthalpy change for the reaction 2A+B⇌2C+2D Use the following data: Substance ΔH∘f (kJ/mol) A -275 B -389 C 195 D -503 Express your answer to three significant figures and include the appropriate units. Hints
