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Date: 3-11-2020
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Date: 2-8-2020
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Date: 4-11-2020
1645
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Chemistry problems that involve enthalpy changes can be solved by techniques similar to stoichiometry problems. Refer again to the combustion reaction of methane. Since the reaction of 1mol
of methane released 890.4kJ, the reaction of 2mol of methane would release 2×890.4kJ=1781kJ. The reaction of 0.5mol of methane would release 890,4kJ2=445.2kJ. As with other stoichiometry problems, the moles of a reactant or product can be linked to mass or volume.
Example 1: Sulfur dioxide gas reacts with oxygen to form sulfur trioxide in an exothermic reaction according to the following thermochemical equation.
Calculate the enthalpy change that occurs when 58.0g of sulfur dioxide is reacted with excess oxygen.
Solution
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دراسة يابانية لتقليل مخاطر أمراض المواليد منخفضي الوزن
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اكتشاف أكبر مرجان في العالم قبالة سواحل جزر سليمان
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المجمع العلمي ينظّم ندوة حوارية حول مفهوم العولمة الرقمية في بابل
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