Chemistry Scoring Guidelines 2015 - College Board
AP? Chemistry 2015 Scoring Guidelines
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1.0
g
Na
?
1.0 mol Na 22.99 g Na
?
1.0 mol e1.0 mol Na
= 0.043 mol e-
1.0
g Ca
?
1.0 mol Ca 40.08 g Ca
?
2.0 mol e1.0 mol Ca
= 0.050 mol e-
C2H5OH(g) ?c?ata? lyst?? C2H4(g) + H2O(g) DH298 = 45.5 kJ/molrxn; DS298 = 126 J/(K molrxn)
ethanol
ethene water
1 atm 760 torr
n=
PV RT
=
(0.775 atm)(0.0854 L) (0.08206 L atm mol-1 K-1)(305 K)
= 0.00264 mol
% yield
=
actual yield maximum possible yield
? 100
=
0.00264 mol 0.00434 mol
DG298
(
e
-DG? RT
)
................
................
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