Homework Help: Chemistry

Posted by Joe on Wednesday, January 30, 2013 at 1:39pm.

You carry out an exothermic reaction inside a Styrofoam cup calorimeter, using a temperature probe to monitor the temperature throughout the reaction. You find that the temperature increases 7.40 °C during the reaction. The specific heat of the reaction solution is known to be 5.59 J/g•°C, and the mass of the solution was measured as 36.0 g. Calculate q, the heat for this reaction, in kJ. Be sure to include the correct sign for your answer.

What I did was the following;

q=(5.59 J/g•°C)(36.0g)(7.40)(1 kJ/ 1000 J) =1.49 kJ

however the program I am working with says I'm wrong.

Chemistry - Devron, Wednesday, January 30, 2013 at 2:02pm
Your numbers are correct. So would he reaction be -1.49kJ or 1.49kj if it is exothermic.
Chemistry - Devron, Wednesday, January 30, 2013 at 2:02pm
Your numbers are correct. So would the reaction be -1.49kJ or 1.49kj if it is exothermic.
Chemistry - Joe, Wednesday, January 30, 2013 at 2:14pm
The program still states this is incorrect
Chemistry - Devron, Wednesday, January 30, 2013 at 5:19pm
Your numbers look correct, except you should have -1.49Kj

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