6:45 PM a learning.up.edu MetroPCS LTE C)36 4 of 8 9. The combustion of titanium
ID: 1032554 • Letter: 6
Question
6:45 PM a learning.up.edu MetroPCS LTE C)36 4 of 8 9. The combustion of titanium with oxyen produces titanium dioxide Tits) +02(g) To When 2.060 g of tsanium is combusted in a bomb calorimeter, the temperature of the calorimeter increases from 25,00C to 91.60C. In a sparatic experiment, the heat capacity of the calorimeter is measured to be 9.84 kK. The heat of eeaction foe the combustice of a mole of Ti in this calorimeter is B) 19.6 C)-311 D)-0.154 E-152 10 0. When 1.50 mol of CHaig) reacts with escess Ciziz) at constant pressure according to the chemical equataon shown below, 1062 kJ of heat are released. Calculate the value of for this A)-1420 k B)-708 kJ C)+708 k D) 1420 k 11. A motor does 30 kJ of work and loses 4 kJ as heat to the surroundings What is the chanpe in the intemal energy of the mosee? A)-34 k )+34 kJ C)-26U 12. Use the information provided to dtermine 1rnn for thg following reaction: CHal75 A)-389kJ B)-113 kJ C)+113 kJExplanation / Answer
9)
c = 9.84 KJ/K = 9.84 KJ/oC
heat released,
q = c*delta T
= 9.84 KJ/oC * (91.60 - 25.00) oC
= 655 KJ
Since. this is heat released, sign will be negative
q = -655 KJ
Molar mass of Ti = 47.87 g/mol
mass(Ti)= 2.060 g
use:
number of mol of Ti,
n = mass of Ti/molar mass of Ti
=(2.06 g)/(47.87 g/mol)
= 4.303*10^-2 mol
delta H = q / number of mol
= -655 KJ / (4.303*10^-2 mol)
= -1.52*10^4 KJ/mol
Answer: E
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