Multiple ChoiceNitromethane (CH3NO2), sometimes used as a fuel for drag racing, burns according to the following reaction: 4 CH3NO2 (l) + 7 O2 (g) → 4 CO2 (g) + 6 H2O (g) + 4 NO2 (g) ∆Hº = – 2441.6 kJHow much heat is released by burning 125.0 g of nitromethane (MW:61.044 g/mol)? 2087views4rank1comments
Multiple ChoiceConsider the following reaction: 2 C6H6 (l) + 15 O2 (g) → 12 CO2 (g) + 6 H2O (g) ∆Hº = – 6278 kJWhat volume of benzene (C6H6, d = 0.880 g/mL, molar mass = 78.11 g/mol) is necessary to evolve 5.19 x 109 kJ of heat? 1011views1rank
Multiple ChoiceThe creation of liquid methanol is accomplished by the hydrogenation of carbon monoxide: CO (g) + 2 H2 (g) → CH3OH (l) ∆Hº = – 128.1 kJHow much heat (in kJ) is released when 125.0 g CO reacts with 2.32 x 102 g H2?2474views3rank
Textbook QuestionThe following equation shows the conversion of aluminum oxide (from the ore bauxite) to aluminum: 2 Al2O3(s) → 4 Al(s) + 3 O2(g) ∆H = +801 kcal/mol (+3350 kJ/mol) How many kilocalories are required to produce 10.0 g of aluminum? How many kilojoules?343views
Textbook QuestionThe vaporization of Br2 from the liquid to the gas state requires 7.4 kcal/mol (31.0 kJ/mol). How many kilojoules are needed to evaporate 82 g of Br2?475views
Textbook QuestionConverting liquid water to solid ice releases 1.44 kcal/mol (6.02 kJ/mol). How many kilocalories are released by freezing 32 g of H2O?435views
Textbook QuestionGlucose, also known as 'blood sugar' when measured in blood, has the formula C6H12O6. What is the minimum amount of energy (in kJ) a plant must absorb to produce 15.0 g of glucose?570views
Textbook QuestionFor the production of ammonia from its elements, ∆H = -22 kcal/mol(-19 kJ/mol). How much energy (in kilocalories and kilojoules) is involved in the production of 0.700 mol of NH3?337views
Textbook QuestionFor the evaporation of water, H2O(l) → H2O(g), AT 100°C, ∆H = +9.72 kcal/mol (+40.7 kJ/mol). How many kilojoules are released when 10.0 g of H2O(g) is condensed?1110views
Textbook QuestionMethanol, CH3OH, is used as race car fuel. How many kilojoules are released by burning 50.0 g of methanol?424views
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