Chemistry, 26.08.2021 17:20 anthonymcnulty321
Một hạt nhân phóng xạ có thể phát ra hạt positron tức e+. Điều này tương ứng với một proton trong hạt nhân biến thành một neutron. Tuy nhiên khối lượng của neutron lại lớn hơn khối lượng của proton. Vậy làm thế nào để sự phát positron nói trên có thể xảy ra được?
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There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. in the first step, calcium carbide and water react to form acetylene and calcium hydroxide: cac2 (s) + 2h2o (g) → c2h2 (g) + caoh2 (s) =δh−414.kj in the second step, acetylene, carbon dioxide and water react to form acrylic acid: 6c2h2 (g) + 3co2 (g) + 4h2o (g) → 5ch2chco2h (g) =δh132.kj calculate the net change in enthalpy for the formation of one mole of acrylic acid from calcium carbide, water and carbon dioxide from these reactions. round your answer to the nearest kj .
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Một hạt nhân phóng xạ có thể phát ra hạt positron tức e+. Điều này tương ứng với một proton trong hạ...
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