8: …and caffeine

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

 

guy holding cup of coffee (t-shirt reads "sleep is overrated")

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194 grams would be one heck of a cup of coffee.