Ethanol (C,H,0), a gasoline additive, is formed by the reaction of ethylene (CH,=CH,) with water. The AH for this reaction is -9.0 kcal. H H c=C H20 C2H60 H H ethanol ethylene a. How much energy is released when 3.5 mol of ethylene SD10 ni zbnod reacts? b. How much energy is released when 0.50 mol of H,O reacts? c. How much energy is released when 15.0 g of ethylene reacts? d. How much energy is released when 2.5 g of ethanol is eritou formed? HA

A lead ore, galena, consisting mainly of lead(II) sulfide, is the principal source of lead. To obtain the lead, the ore is first heated in the air to form lead oxide. PbS(s)+32 O2(g)PbO(s)+SO2(g)H=415.4kJ The oxide is then reduced to metal with carbon. PbO(s)+C(s)Pb(s)+CO(g)H=+108.5kJCalculate H for the reaction of one mole of lead(II) sulfide with oxygen and carbon, forming lead, sulfur dioxide, and carbon monoxide.

Use Table 8.3 to obtain AHO for the following thermochemical equations: (a) Mg(OH)2(s)+2NH4+(aq)Mg2+(aq)+2NH3(g)+2H2O(l) (b) PbO(s)+C(s)CO(g)+Pb(s) (c) Mn(s)+4 H+(aq)+SO42 Mn2+(aq)+SO2(g)+2H2O(l)

Hydrogen chloride gas dissolves in water to form hydrochloric acid (an ionic solution). HCl(g)H2OH+(aq)+Cl(aq) Find H for the above reaction. The data are given in Table 6.2.

9.89 A sample of gas is 80.0% CH4 and 20.0% C2H6 by mass. What is the heat from the combustion of 1.00 g of this mixture? Assume the products are CO2 (g) and H2O (l).

Explain why each of the following chemical equations is not a correct formation reaction: 4Al( s )+3 O 2 ( g )2 Al 2 O 3 ( s ) N 2 ( g )+ 3 2 H 2 ( g ) NH 3 ( g ) 2Na( s )+O( g ) Na 2 O( s )

9.75 Explain why each of the following chemical equations is not a correct formation reaction. (a) 4Al(s)+3O2(g)2Al2O3(s) (b) N2(g)+32H2(g)NH3(g) (c) 2Na(s)+O(g)Na2O(s)

The equation for the combustion of 2 mol of butane can be written 2C4H10(g)+O2(g)8CO2(g)+10H2O(g);HO Which of the following produces the least heat? a Burning 1 mol of butane. b Reacting 1 mol of oxygen with excess butane. c Burning enough butane to produce 1 mol of carbon dioxide. d Burning enough butane to produce 1 mol of water. e All of the above reactions (a, b, c, and d) produce the same amount of heat.

How much heat is released when a mixture containing 10.0 g NH3 and 20.0 g O2 reacts by the following equation? 4NH3(g)+5O2(g)4NO(g)+6H2O(g);H=906kJ

Hypothetical elements A2 and B2 react according to the following equation, forming the compound AB. A2(aq)+B2(aq)2AB(aq);H=+271kJ/mol If solutions A2(aq) and B2(aq), starting at the same temperature, are mixed in a coffee-cup calorimeter, the reaction that occurs is a exothermic, and the temperature of the resulting solution rises. b endothermic, and the temperature of the resulting solution rises. c endothermic, and the temperature of the resulting solution falls. d exothermic, and the temperature of the resulting solution falls. e exothermic or endothermic, depending on the original and final temperatures.