40
QuizMultiple Choice

N/A — Exam

Question 40 • Chemistry

A sample of propane open paren cap c sub 3 cap h sub 8 close paren has a mass of 0 point 4 7 g The sample is burned in a bomb calorimeter that has a mass of 1 point 3 5 0 kilograms and a specific heat of 5 point 8 2 the fraction with numerator cap j and denominator open paren g times degree cap c close paren How much energy is released by the reaction if the temperature of the calorimeter rises by 2 point 8 7 times degree C ? Use q is equal to m cap c sub p triangle cap t

Answer
A
10 point 6 kJ
B
47 point 9 kJ
C
7 point 8 5 kJ
D
22 point 5 kJ

Explanation

Use q = mcₚΔT for the calorimeter. Convert its mass to grams: 1.350 kg = 1350 g. Then q = (1350 g)(5.82 J/(g·°C))(2.87 °C) = 22,550 J, or about 22.5 kJ. Thus, the reaction releases 22.5 kJ of energy, choice D.

AI-written and checked against the verified answer.

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