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1.KClo3 was heated and decomposed by the following reaction:KCLO3→KCl+O2The oxygen produced was collected by displacement of water at 22度Cat a total pressure of 754 torr . the volune of the gas collected was 0.65Land the vapor pressure of water at 22度c is 21 torr.Calculate the partial pressure of o2 in... 顯示更多 1.KClo3 was heated and decomposed by the following reaction:KCLO3→KCl+O2 The oxygen produced was collected by displacement of water at 22度C at a total pressure of 754 torr . the volune of the gas collected was 0.65L and the vapor pressure of water at 22度c is 21 torr. Calculate the partial pressure of o2 in the gas collected and the mass of KCLO3 in the sample that was decomposed. 2.Consider a 5.14g mixture of cao and bao placed in a 1.50l flask containing co2 at 30.0c and 750. torr after the reaction to form BaCO3 and CaCO3 was completed, the pressure of co2 remaining was 230. torr. Calculate the mass percentages of Cao and Bao in the mixture.

最佳解答:

1. KClO3 --> KClO + O2 O2分壓 = 754 - 21 = 733 torr O2莫耳數 n = PV/RT = (733/760)x0.65/(0.082x295.15) = 0.0259 mol 由反應式知同樣有0.0259莫耳氯酸鉀被分解，其質量 = 0.0259 x 122.55 = 3.174 克。 2. 設混合物中，有X克的CaO及Y克的BaO 則 X + Y = 5.14 ......................... (1) 反應式： CaO + CO2 --> CaCO3 X克的CaO反應完，耗掉CO2的莫耳數 = X/56.077 BaO + CO2 --> BaCO3 Y克的BaO反應完，耗掉CO2的莫耳數 = Y/153.33 被消耗掉的CO2莫耳數 ?n = ?pV/RT = (750-230)/760x1.5/(0.082x303.15) = 0.0413 因此 X/56.077 + Y/153.33 = 0.0413 ........ (2) 聯立解(1)(2)，X = 0.688，Y = 4.452 CaO佔百分率 = 0.688/5.14x100% = 13.385% BaO佔百分率 = 4.452/5.14x100% = 86.615%

其他解答:8758B59A7FA1EEA7

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