Question

molar 7. How many grams of CO 28.01 /mol) must be bumed to produce 225 kJ of heat urma 2006 +020 200260 AH = -566 kJ c) 2238 ite a) 0.398 8 b) 0.795 g c) 2.52 g d) 11.1 g 3. Calculate the mass of excess reactant remaining after 4.50 mol of LHCO (67.96 R/mol) and 8.50 mol of H2504 (98.08 g/mol) reacted according to the equation shown below. 2LHCO3 + H2SO4 - Li2SO4 + 2H20 + 2002 e) 834 g a) 153 g b) 221 g c) 4418 d) 613 g RT 9. How many moles of gas are contained in a 75 L flask at 425 K if the pressure is 380 mmHg? a) 817 mol c) 2.15 mol c) 0.0106 mol b) 409 mol d) 1.08 mol 10. What is the percent yield of a reaction that produces 4.8 mole of SOs from the reaction of 6.4 mol of H2504 and excess HB? H2SO4 + 2HBr → SO2 + Br2 + 2H20 a) 25 % b) 38 % c) 56% d) 75 % c) 133 % 11. A 25 L flask at 25°C contains 0.75 mol of N2, 0.50 mol of O2 and 1.25 mol of CO. What is the total pressure? a) 0.0082 atm c) 21 atm c) 500 atm b) 2.4 atm d) 250 atm 12. A 25.0 g piece of iron (c = 0.451/8°C) initially at 21.0°C absorbs 3100 J of heat. What is its final temperature? a) 253.9 K c) 295.9°C e) 295.9 K b) 274.9 K d) 253.9°C 13. A weather balloon lift off at 1.00 atm and 25.0°C with a volume of 1.5 X 10 L. What is the volume of the balloon at an altitude of 21 km where the temperature is -50°C and the atmospheric pressure is 0.100 atm? a) 3.0 x 104 L c) 1.1 x 104 L e) 1.1 X 102 L b) 2.0 x 104 L d) 3.0 x 102L - The density of a gas at 1.00 atm and 25.0°C is 1.798 g/L, which of the following is most likely the gas? a) CO2 c) SO2 e) Ar b) NO d) 02

Answer 1

© 200+ 02->2 coz OH= -566 kJ By sun, 2molto produces = 566 kJ of heat - 4225 kJ heat produced by = ( 2 / 26x225) mol s 0.795 mol Now, mama moles y molar mam of.co. = 0.795 mol X 28.01 g/mol = 22.278 122.39)