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王日權 發表於 2012-12-26 01:50 PM

氣體的問題麻煩大大們幫我解答^^

81.        A method of removing CO2 from a spacecraft is to allow the CO2 to react with sodium   hydroxide.  (The products of the reaction are sodium carbonate and water.)  What volume of carbon dioxide at 25°C and 749 mmHg can be removed per kilogram of sodium hydroxide that reacts?
                A)  276 L    B)  284 L    C)  301 L    D)  310 L    E)  620 L


90.        A block of dry ice (solid CO2, density = 1.56 g/mL) of dimensions 25.0 cm × 25.0 cm × 25.0 cm is left to sublime (i.e. to pass from the solid phase to the gas phase) in a closed chamber of dimensions 4.00 m × 5.00 m × 3.00 m.  The partial pressure of carbon dioxide in this chamber at 25°C will be
        A)        0.171 mmHg        D)        107 mmHg
        B)        0.225  mmHg        E)        171 mmHg
        C)        14.4 mmHg       


91.        A 2.50-L flask contains a mixture of methane (CH4) and propane (C3H8) at a pressure of 1.45 atm and 20°C.  When this gas mixture is then burned in excess oxygen, 8.60 g of carbon dioxide is formed.  (The other product is water.)  What is the mole fraction of methane in the original gas mixture?
                A)  0.145    B)  0.341    C)  0.659    D)  0.855    E)  1.00


112.        A convenient way to produce very high purity oxygen in the laboratory is to decompose KMnO4(s) at high temperature according to the following chemical equation:
                          2KMnO4(s)    K2MnO4(s) + MnO2(s) + O2(g)
                If 2.50 L of O2(g) is needed at 1.00 atm and 20.°C, what mass (in grams) of KMnO4(s) should be decomposed? Assume the decomposition of KMnO4(s) goes to completion.
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