Calculating Molar Mass Lesson 9

1
Calculating Molar MassLesson 9
2
An odiferous gaseous compound called methyl
mercaptan is produced in the intestinal track of
the human body and by rotting eggs or broccoli.
If 12.00 g of this gas is equivalent to 0.2493
moles. Calculate the molar mass.

48.13 g/mole
12.00 g
Molar Mass
0.2493 moles
If this compound is made of C, H, and S,
determine the molecular formula
CH4S
3
Draw the structural diagram for this compound
Draw the electron-dot diagram for this compound
4
Another odiferous gas that is produced by the
human digestive track is collected and weighed to
be 0.0429 g. An equal volume of methyl mercaptan
weighs 0.06051 g. Calculate the molecular mass of
this gas and determine its identity. Hint it
contains sulphur.

Gas X
0.04290 g
0.70897
x 48.13 g/mole
34.1 g/mole
CH4S
0.06051g
H2S
5
Calculate the number of H atoms in C24H36N3O3 if
there are 864.0 C atoms.
864.0 at C
x 1 molecule
x 36 at H
1296 at H
24 at C
1 molecule