Convert -40. kcal/mol to kJ/mol using the fact that 1kcal = 4.184 kJ. Show work using dimensional analysis. %3D -40, kcal mol O a. 1 kcal 4.184 kJ kJ = -9.6 mol O b. -40. kcal v 4.184 kJ mol kJ = -170- mol 1 kcal

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Convert -40. kcal/mol to kJ/mol using the fact that 1kcal = 4.184 kJ. Show
work using dimensional analysis.
1 kcal
4.184 kJ
kcal
kJ
= -9.6
mol
O a.
-40.
mol
O b.
-40, kcal v 4.184 kJ
kJ
= -170-
mol
mol
1 kcal
Once we know the value of AHrxn it is possible to solve many other types of
problems.
For example, how many moles of zinc should we react with 6HCI to generate
120 kJ of heat?
a. 120 kJ
1 mol
= 0.71 mol
-170 kJ
O b. 120 kJ -170 kJ
1 mol
20,000 mol
%3D
How many grams of zinc react with excess 6M HCI if 500. kJ of heat are
released?
Use dimensional analysis, the AHxn and the atomic mass of zinc.
O a. 500. kJ
1 mol
65.39 g
190 g Zn
%D
-170 kJ
1 mol
Transcribed Image Text:Convert -40. kcal/mol to kJ/mol using the fact that 1kcal = 4.184 kJ. Show work using dimensional analysis. 1 kcal 4.184 kJ kcal kJ = -9.6 mol O a. -40. mol O b. -40, kcal v 4.184 kJ kJ = -170- mol mol 1 kcal Once we know the value of AHrxn it is possible to solve many other types of problems. For example, how many moles of zinc should we react with 6HCI to generate 120 kJ of heat? a. 120 kJ 1 mol = 0.71 mol -170 kJ O b. 120 kJ -170 kJ 1 mol 20,000 mol %3D How many grams of zinc react with excess 6M HCI if 500. kJ of heat are released? Use dimensional analysis, the AHxn and the atomic mass of zinc. O a. 500. kJ 1 mol 65.39 g 190 g Zn %D -170 kJ 1 mol
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