In lab, a student weighed out 3.281 g of an unknown salt. Her coffee cup calorimeter...
In lab, a student
weighed out 3.281 g of an unknown salt. Her coffee cup calorimeter
weighed 36.763 g. After adding water it weighed 94.732 g. Before
the addition of salt, the temperature of the water in the coffee
cup was 19.5 d e g r e e s C . After all the
salt dissolved the maximum temperature was 25
d e g r e e s C . Calculate the
enthalpy of solution for the salt,
d e l t a H o f s o l u t i o n
. Report your answer in J.
You can practice the math using this virtual lab. Note: Use the "Solids" tab to select a practice salt.
Homework Answers
Mass of water = total mass - mass of calorimeter
= 94.732 - 36.763
= 57.969
Mass of solution = mass of water + mass of salt
= 57.969 + 3.281
= 61.25 grams
Q = mass * specific heat * ∆T
= 61.25 * 4.184 * ( 25 - 19.5)
= 1409.485 J
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