Final Exam TA Review PacketTest 11)Which amount contains the fewest atoms1.a)1.00g Au1.b)1.00g Ag1.c)1.00g Pb1.d)1.00g W1.e)1.00g Cl2)Which amount contains the most atoms2.a)1.00g CCl42.b)1.00g Br22.c)1.00g HCN2.d)1.00g CDiamond3)Calculate the atomic weight of Calcium assuming the fallowing abundances:3.a)40Ca 80%3.b)42Ca 15%3.c)44Ca 4.95%3.d)46Ca .05%4)Which of the following represents an empirical formula? 4.a)C10H14N2 4.b)HO 4.c)P4O10 4.d)C3H6 4.e)Na2C2O4
5)Which of the following only has covalent bonding? ________5.a)NaCl5.b)NH4HSO35.c)KNO35.d)As 5.e)CO26)For the isotope 6.a)What is the weight (in amu)?6.b)How many electrons?6.c)How many protons?6.d)How many neutrons?7)Balance the following equations?7.a)____Cu + ____HNO3== ____Cu(NO3)2 + ____NO + ____H2O7.b)____HClO4+ ____P4O10== _____H3PO4+ ____Cl2O77.c)____NH4NO3== ____N2+ ____O2+ ____H2O7.d)____Zn + ____ HCl == ____ZnCl + ____H28)A substance is found to be composted of the following elements 13.5g Ca, 10.8 g O and .675 g H what is the empirical formula? The molar mass is found to be 74.094 what is the molecular formula?9)2AlCl3(aq) + 3H2SO4(aq) == Al2(SO4)3(aq) + 6HCl(aq) 9.a)25.0g of AlCl3was mixed with 30.0g H2SO4How much Al2(SO4)3can be isolated?9.b)Eventually, 28.46g of pure Al2(SO4)3was isolated. Calculate the percent yield?
Test 210)A cylinder of argon gas contains 50.0 L of Ar at 18.4 atm and 127 °C. How many moles of argon are in the cylinder?11)What is the applied external pressure to a gas contained in an ideal piston, if the change in internal energy is +31kJ, 9 kJ of heat is absorbed by the surroundings and the change in volume is -15 L?12)What is the change in volume of a gas in an ideal piston whose internal energy increases by 20 kJ, with no heat exchange, with an external pressure of 5 atm?
13)Find the heat constant of a calorimeter composed of 100g water at 58.5 C with 100g of water, already in the calorimeter, at 22.8 C, the final tempeture of the water is 39.7 C? 14)In a mixture of helium and Oxygen the mole fraction of Helium is .6 and the partial pressure is 5 atm? What is the partial pressure of Oxygen, of the whole mixture?15)In a new mixture of helium and oxygen in a 5L container, the mole fraction of helium is .4 If there are 45g of O2at 400K, what is the partial pressure of He?16)Three bulbs are connected as shown in the diagram below. Bulb I, II, and III, contain argon, oxygen, and nitrogen, respectively. All three gasses do not react with each other.
16.a)Bulb I, II, and III are 3.00 L, 1.00 L, and 6.00 L, respectively. The pressure of bulbs I through III are 1.00 atm, 1.00 atm, and 3.00 atm, respectively. What is the mole fraction of oxygen in the apparatus when all valves between the bulbs are opened. Assume the connecting tube as zero volume and that T is constant.16.b)Now, assume the volume of bulbs I through III are 0.750 L, 0.250 L and the right is 3.00 L, respectively. The pressures are 4.00 atm, 2.00 atm, and 9.00 atm, respectively. What will the final pressure in the apparatus be in this instance?