Answer to Question #117215 in General Chemistry for Sara

Question

100 cm3 of 2.0 moldm-3 hydrochloric acid is poured into 100 cm3 of 2.0 moldm-3 sodium hydroxide solution. The initial and final temperature are immediately recorded as shown below.[Specific heat capacity = 4.2 J/g°C, density of solution = 1.0 gcm-3]. What is the value of heat released in the reaction?
Initial temperature of hydrochloric acid: 29.0°C
Initial temperature of sodium hydroxide solution: 29.0°C
Highest temperature of the mixture: 35.0°C

Answer options:
a) 5040J
b) 504J
c) 2520J
d) 5040kJ

Answer 1

$Q=cm\Delta T=4.2J/g^ oC*200cm3*1g/cm3(35-29)^oC=5040J$

The answer is a) 5040J