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Hellohi21 Hellohi21
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3 years ago
The combustion of titanium with oxygen produces titanium dioxide:

Ti(s) +  (g)     (s)

When 1.720 g of titanium is combusted in a bomb calorimeter, the temperature of the calorimeter increases from 25.00C to 80.10C. In a separate experiment, the heat capacity of the calorimeter is measured to be 9.84 kJ/K. The heat of reaction for the combustion of a mole of Ti in this calorimeter is ________ kJ/mol.
A) 9.76
B) 14.2
C) -311
D) -0.154
E) -1.51
Textbook 

Chemistry: A Molecular Approach


Edition: 4th
Author:
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Answer verified by a subject expert
CalybooCalyboo
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Posts: 187
3 years ago Edited: 2 days ago, bio_man
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More questions for this book are available here
 E

Q cal = Ccal*delta T

Q cal = 9.84*(80.1-25.0)

Q cal = 5.422*10^2 KJ

This heat is supplied by Ti

Molar mass of Ti = 47.87 g/mol

mass(Ti)= 1.720 g

use:

number of mol of Ti,

n = mass of Ti/molar mass of Ti

=(1.72 g)/(47.87 g/mol)

= 3.593*10^-2 mol

use:

delta H = -Qcal/number of mol

= -5.422*10^2 KJ / 3.593*10^-2 mol

= -1.509*10^4 KJ/mol

Answer: -1.51*10^4 KJ/mol

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