Question

Propane, c3h8, is commonly provided as a bottled gas for use as a fuel. in 0.200 mol of propane: (show all your work)

a. what is the mass of propane

Answer 1

The molar mass of propane is C₃H₈ - (12x3) + (1x8)= 44 g/mol
This means that 1 mol of propane weighs 44 g
The number of moles of propane present - 0.200 mol
1 mol weighs - 44 g
Therefore 0.200 mol of propane weighs - 44 g/mol x 0.200 mol = 8.8 g
Mass of propane present  - 8.8 g 

Answer 2

The mass of 0.200 moles of Propane is calculated as follow,

Data Given:
                    Moles  =  0.200 mol
                    M.Mass  =  44 g/mol           ∴ C₃ = (12 × 3 = 36)
                                                                   H₈ = (1  × 8  = 8)
                                                                   C₃H₈ = 44 g/mol
Formula Used,
                                 Moles  =  mass ÷ M.mass
Solving for mass,
                                 Mass  =  Moles × M.Mass
Putting Values,
                                 Mass  = 0.200 mol × 44 g/mol

                                 Mass  =  8.8 g