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Chemistry Senior High

酸素の生成熱は表に記載されていないのですが、単体の生成熱は0とされているからマーカーのようになっているのでしょうか

280>反応熱次の(1)~(5)の変化に伴う反応熱を、それぞれ何というか答え 4章 基本→28 アセチレン CH。 の燃焼熱は何 J/mol か。整数 値で答えよ。ただし, 水は液体として生じるものと し、水の蒸発熱は44kJ/mol である。 右の生成熱の表も利用せよ。 基本例題 58 生成熱と反応熱 物質 生成熱(kJ/mol H,0(気) CO。(気) 242 394 (自治医大) CH。(気) 84 リ-52 ターホエで塗社単 CH(気) る来全議ア CH。(気) =228 ●エクセル 反応熱= (生成物の生成熱の総和) - (反応物の生成熱の総和) 考え方 解答 CH(気), O.(気), CO2 アセチレンの燃焼の熱化学方程式は (気)の生成熱はそれぞれ、 -228, 0, 394kJ/mol で 5 CHe(気)+-0。(気) =D 2CO2 (気)+ H.O(液) + QkJ 開句 水の蒸発熱が 44kJ/mol であるので こさす( HO(気)=HO(液) + 44kJ…0 0 ある。 H.O(液)の生成熱は, H.O(気)の生成熱と水の H:O(気)の生成熱は242kJ/mol より, 蒸発熱から求める。 化学エネルギー り. これを )エネルギーの He(気)+ 1 O。(気) =D H.O(気)+ 2421kJ…② 2 SY See 0, の式より,(①+②) 眼の a 限本 用は大 排の O+(機黒)) He(気)+ (気) %3DH.O(液)+ 286 kJ よって、HO(液)の生成熱は,286 kJ/molo 反応熱= (生成物の生成熱の総和) まる反(反応物の生成熱の総和 のテ付gm O( より、Q= (2× 394 + 286) 5 x0= 1302 228 +- 基本問題 1302 kJ/mol (1) NaNO。(固) + aq= NaNO3 aq - 21 kJ (2) HCl aq + NaOH aq=D NaCl aq + HO (液) (3) CoH.CH(適)

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Chemistry Senior High

【英語ですみません】最後の12番は何を書いたら良いのでしょうか…? Video C の実験では、aqueous solution にlead(ii) nitrate, aqueous solution にPottasium iodide を入れていました。 2KI (aq)... Read More

With lead (I) nitrate solution. This precipitation reaction produces a bright yellow solid. (point values in parentheses) Part 1: 1. Copy the unbalanced reaction below into your lab notebook. Balance the reaction by adding coefficients. (1) KI (aq) Pb(NO,), (aq) KNO, (aq) Pbl, (s) 2. a) Which trial are you assigned? b) Copy the data table below into your notebook. Watch video A (make sure it's the correct trial!) and collect your data. You may need to pause or rewatch the video, it goes quickly. (1.5) Mass of Empty Beaker (g) Mass of Beaker+ solid Pb(NO,)。(g) Volume of 1.0 M KI (aq) (mL) For the following calculations, show all your work for full credit. 3. What mass of solid Pb(N0,), was added to the beaker? (1) 4. If the solid Pb(NO,), was dissolved in 45 mL of water, what is the molarity of the Pb(NO,)。 solution? (2.5) 5. Which compound is the limiting reactant? (4) 6. What mass of lead (II) iodide (PbL,) should be produced? (2) Part 2: 7. Watch video B (make sure it's the correct trial!) to see the complete reaction and collection of the product. Copy the data table below and record your data. (1) Mass of filter paper (g) Mass of filter paper + dried precipitate (g) 8. What mass of precipitate was collected? Show your work. (1) Calculate the percent yield for the reaction. Show your work. (2) 10. For your trial, which three ions were present in the filtered solution at the end of the reaction? In other words, which three ions are still dissolved at the end of the reaction? Defend/explain your 9. answer. (3) 11. Watch video C - watch both tests for your trial and record your observations. (1) a) Add lead (II) nitrate - b) Add potassium iodide - 12. These tests were conducted to prove the identity of the limiting reactant. Considering your answers to the previous two questions, describe how these tests support the prediction you made in question 5 about which compound is the limiting reactant. (2)

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