How about a half mol of instant coffee powder in your cup?
The formula for caffeine is C8H10N4O2 ... see if you can remember the molecular weights (rounded off to the nearest gram) for each of these elements, rather than looking them up.
| 1 H 1.01 |
2 He 4.00 |
||||||||||||||||
| 3 Li 6.94 |
4 Be 9.01 |
5 B 10.81 |
6 C 12.01 |
7 N 14.01 |
8 O 16.00 |
9 F 19.00 |
10 Ne 20.18 |
||||||||||
| 11 Na 22.99 |
12 Mg 24.30 |
13 Al 26.98 |
14 Si 28.09 |
15 P 30.97 |
16 S 32.07 |
17 Cl 35.47 |
18 Ar 39.98 |
||||||||||
| 19 K 39.10 |
20 Ca 40.09 |
21 Sc 44.96 |
22 Ti 47.88 |
23 V 50.94 |
24 Cr 51.94 |
25 Mn 54.94 |
26 Fe 55.85 |
27 Co 58.93 |
28 Ni 58.69 |
29 Cu 63.55 |
30 Zn 65.39 |
31 Ga 69.72 |
32 Ge 72.61 |
33 As 74.92 |
34 Se 78.96 |
35 Br 79.90 |
36 Kr 83.80 |
×
+
×
+
×
+
×
=
194 grams would be one heck of a cup of coffee.
Copyright University of Maryland, 2007
You may link to this site for educational purposes.
Please do not copy without permission
requests/questions/feedback email: mathbench@umd.edu