Homework SourseA student performed experiment 8 Step1 he massed a styroform
A student performed experiment 8:
Step1: he massed a styroform cup with a stir bar and obtained a mass of 13.001g.
Step 2:He added 100.0mL of DI water, began stirring.
Step 3: He connected the thermistor recorded a temperature of 20.0 oC.
Step 4: He added 8.004 g of ammonium nitrate, and notices that the temp. is decreasing.
Step 5:He analysed his graph and obtained final temp of 14.5oC.
Step 6: He massed the Styrofoam cup and obtained a mass of 121.000g.
Calculate:
a. q : the heat released / absorbed as ammonium nitrate is dissolved.
: q = mCsolution?T + Cstyroformcup ?T,
Data: Csolution = 4.18 J/(g oC) and Cstyroform cup = 25.0 J/oC
need help ASAP
A student performed experiment 8:
Step1: he massed a styroform cup with a stir bar and obtained a mass of 13.001g.
Step 2:He added 100.0mL of DI water, began stirring.
Step 3: He connected the thermistor recorded a temperature of 20.0 oC.
Step 4: He added 8.004 g of ammonium nitrate, and notices that the temp. is decreasing.
Step 5:He analysed his graph and obtained final temp of 14.5oC.
Step 6: He massed the Styrofoam cup and obtained a mass of 121.000g.
Calculate:
a. q : the heat released / absorbed as ammonium nitrate is dissolved.
: q = mCsolution?T + Cstyroformcup ?T,
Data: Csolution = 4.18 J/(g oC) and Cstyroform cup = 25.0 J/oC
need help ASAP
Solution
mass of solution = 121-13.001
= 107.999 g
delta T = 20-14.5 = 5.5
q = 5.5* 107.999* 4.18 + 5.5*13.001*25
= 2482.897 + 1787.637
=4270.5345 J
