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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