Question

9 multiple choice 1 point calculate the molecular mass of caffeine. c₈h₁₀n₄o₂, caffeine

	carbon (c)	hydrogen (h)	nitrogen (n)	oxygen (o)
average atomic mass	12.0107	1.0079	14.0067	15.9994

○ 190.22 amu
○ 200.25 amu
○ 194.19 amu
○ 100.00 amu
clear my selection

Explanation:

Step1: Identify atoms and counts

Caffeine formula: \( C_8H_{10}N_4O_2 \). So, C: 8, H: 10, N: 4, O: 2.

Step2: Calculate mass for each element

• C: \( 8 \times 12.0107 = 96.0856 \)
• H: \( 10 \times 1.0079 = 10.079 \)
• N: \( 4 \times 14.0067 = 56.0268 \)
• O: \( 2 \times 15.9994 = 31.9988 \)

Step3: Sum the masses

Total mass: \( 96.0856 + 10.079 + 56.0268 + 31.9988 = 194.1902 \approx 194.19 \) amu

Answer:

194.19 amu (corresponding to the option with 194.19 amu)