Calculate the molecular masses (in amu the following compounds:
a. sulfur diaxide (SO2), a gas that is responsible for acid rain, and
b. caffeine (C8H10N4O2)stimulant present in teo, coffee, and cola
beverages.
To calculate the molecular masses of the given compounds, we need to determine the atomic masses of each element present in the compound and then add them together according to their respective subscripts.
a. Sulfur Dioxide (SO2):
The atomic mass of sulfur (S) is 32.06 amu.
The atomic mass of oxygen (O) is 16.00 amu.
Using these values, we can calculate the molecular mass of sulfur dioxide:
Molecular mass of SO2 = (Atomic mass of S) + 2 × (Atomic mass of O)
= (32.06 amu) + 2 × (16.00 amu)
= 32.06 amu + 32.00 amu
= 64.06 amu
Therefore, the molecular mass of sulfur dioxide (SO2) is 64.06 amu.
b. Caffeine (C8H10N4O2):
The atomic mass of carbon (C) is 12.01 amu.
The atomic mass of hydrogen (H) is 1.01 amu.
The atomic mass of nitrogen (N) is 14.01 amu.
The atomic mass of oxygen (O) is 16.00 amu.
Using these values, we can calculate the molecular mass of caffeine:
Molecular mass of C8H10N4O2 = (8 × Atomic mass of C) + (10 × Atomic mass of H) + (4 × Atomic mass of N) + (2 × Atomic mass of O)
= (8 × 12.01 amu) + (10 × 1.01 amu) + (4 × 14.01 amu) + (2 × 16.00 amu)
= 96.08 amu + 10.10 amu + 56.04 amu + 32.00 amu
= 194.22 amu
Therefore, the molecular mass of caffeine (C8H10N4O2) is 194.22 amu.