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 |
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| 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 |
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| 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 |
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| 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 |
× +
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× +
× =
194 grams would be one heck of a cup of coffee.