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題組內容

3. Are the following processes exothermic or endothermic?

(d). N_2(g) + 20_2(g) + 16.2 kcal→2NO_2(g)

其他申論題

2. Calculate the number of grams of O2 that will react with 1.00 mol of C3H8.

(a). Fuel oil is burned in a furnace.

(b). C6H12O6(S)→ 2C2H5OH(i) + 2C02(g)，△H= -16 kcal

(c). N2O5(g) + H20(l) + 2HN03(i) → 2HN03(1) +18.3 kcal

4. The density of ethanol at 20°C is 0.789 g/mL. What is its specific gravity?

(a). 58 protons, 58 electrons, and 78 neutrons,

(b). 17 protons, 17 electrons, and 20 neutrons?

(a). Ammonium phosphate; (NH4)2PO3

(b). Barium carbonate; Ba2CO3

(c). Aluminum sulfide; AI2S3

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