Q110P - Chemistry: Molecular Nature Of Matter And Change

Question

Give the formula, name, and molecular mass of the following molecules:

Step-by-Step Solution

Answer

1. The compound name is Sulfur trioxide, the formula is${\mathbf{SO}}_{\mathbf{3}}$, and Molecular mass is 80.057amu.
2. The compound name is Propane, the formula is${\mathbf{C}}_{\mathbf{3}}{\mathbf{H}}_{\mathbf{8}}$, and Molecular mass is 44.11amu.

Step 1: To Give the formula, name, and molecular mass for a

The molecule consists of 3 oxygen atoms and 1 sulfur atom.

So, the molecular formula is${\mathbf{SO}}_{\mathbf{3}}$ .

The name of the compound is Sulfur trioxide.

Molecular mass of${\mathbf{SO}}_{\mathbf{3}}\mathbf{=}\mathbf{Atomic}\mathbf{ }\mathbf{mass}\mathbf{ }\mathbf{of}\mathbf{ }\mathbf{S}\mathbf{+}\mathbf{3}\mathbf{\times }\mathbf{Atomic}\mathbf{ }\mathbf{mass}\mathbf{ }\mathbf{of}\mathbf{ }\mathbf{O}$

$\mathbf{=}\mathbf{32}\mathbf{.}\mathbf{06}\mathbf{+}\mathbf{3}\mathbf{\times }\mathbf{15}\mathbf{.}\mathbf{99}$

Molecular mass $\mathbf{80}\mathbf{.}\mathbf{057}\mathbf{ }\mathbf{amu}$.

Step2: To Give the formula, name, and molecular mass for b

The molecule consists of 3 carbon atoms and 8 hydrogen atoms.

Molecular formula is${\mathbf{C}}_{\mathbf{3}}{\mathbf{H}}_{\mathbf{8}}$ 

The Name of the compound is Propane, as it belongs to the alkane family (ane suffix) and third member of the alkane family (for the three-word root is a prop).

Molecular mass of$\left({\mathbf{C}}_{\mathbf{3}}{\mathbf{H}}_{\mathbf{8}}\right)$

$$\begin{gathered} \mathbf{=}\mathbf{3}\mathbf{\times }\mathbf{Atomic}\mathbf{ }\mathbf{mass}\mathbf{ }\mathbf{of}\mathbf{ }\mathbf{C}\mathbf{+}\mathbf{8}\mathbf{\times }\mathbf{Atomic}\mathbf{ }\mathbf{mass}\mathbf{ }\mathbf{of}\mathbf{ }\mathbf{H} \\ \mathbf{=}\mathbf{3}\mathbf{\times }\mathbf{12}\mathbf{.}\mathbf{01}\mathbf{+}\mathbf{8}\mathbf{\times }\mathbf{1}\mathbf{.}\mathbf{01} \end{gathered}$$

Molecular mass $\mathbf{=}\mathbf{44}\mathbf{.}\mathbf{11}\mathbf{ }\mathbf{amu}$