SOLVED

81) If a substance has a heat of condensation of -1.46 kJ/g and a heat of sublimation of 4.60 kJ/g, what is its heat of solidification in kJ/g? A) 4.60 – 1.46 kJ/g B) -(4.60 + 1.46) kJ/g C) 1.46 – 4.60 kJ/g D) 4.60 + 1.46 kJ/g E) 0 kJ/g 82) If 34 g of a solid of mol mass = 174 g/mol requires 21.3 kJ to melt it, what is the molar heat of fusion in kJ/mol? A) (21.3)(174)(34) kJ/mol B) (21.3/174)(34) kJ/mol C) (21.3/174)/34 kJ/mol D) (21.3)(174/34) kJ/mol E) (34/21.3)(174) kJ/mol 83) Ethyl alcohol (CH3CH2OH) has a heat of fusion of 5.01 kJ/mol. How much heat in kJ is required to melt 137g of ethyl alcohol? A) 1.70 × 103 kJ B) 129 kJ C) 686 kJ D) 5.01 kJ E) 14.9 kJ 84) The heat of fusion for water is 6.01 kJ/mol and for ethyl alcohol is 5.01 kJ/mol. The amount of heat that would melt 25.0 grams of water would melt how many grams of ethyl alcohol? A) 76.7 g B) 53.3 g C) 11.7 g D) 8.2 g E) 30.0 g 85) The heat of fusion for napthalene (C10H8) is 18.98 kJ/mol and for sodium is 2.60 kJ/mol. The amount of heat that would melt 37.0 grams of napthalene would melt how many grams of sodium? A) 0.909 g B) 1510 g C) 28.3 g D) 48.4 g E) 270. g 86) The process in which a gas is transformed into a solid is called ________. A) vaporization B) condensation C) solidification D) deposition E) fusion 87) The triple point of H2O is at 4.58 mmHg and +0.01°C. Some H2O at -50°C is heated to 120°C at a constant pressure of 0.5 atm. The changes of state occurring in this process are: A) solid to gas B) solid to liquid to gas C) liquid to gas D) solid to liquid E) gas to liquid to solid 88) List the following ionic compounds in order of increasing solubility in water: RbI,    CaO,    KCl A) RbI, CaO, KCl B) KCl, CaO, RbI C) KCl, RbI, CaO D) CaO, KCl, RbI E) RbI, KCl, CaO 89) Which of the following compounds has the largest lattice energy? MgCO3, Na2CO3, Al2(CO3)2 A) Na2CO3 B) MgCO3 C) Al2(CO3)2 D) They all have the same lattice energy. E) Not enough information is available to determine which is largest. 90) All sides are equal in length and all angles are right angles. There is an atom at each corner and one in the absolute center. This is a ________. A) face-centered cubic cell B) simple cubic cell C) unit cell D) body-centered cubic cell E) hexagonal unit cell