The addition polymer polyvinyl chloride (PVC) has the structure [latex]\begin{matrix} H & H & H&H&H&H \\ \mid &\mid & \mid&\mid&\mid&\mid \\ -C- & C- & C-&C-&C-&C- \\ \mid &\mid & \mid&\mid&\mid&\mid\\H& Cl&H&Cl&H&Cl \end{matrix}[/latex] a Draw the structure of the monomer from which PVC is made. b How many monomer units are in a PVC polymer that has a molar mass of [latex]1.33 \times 10^5[/latex] g/mol? ANALYSISS Information given: From part (a): monomer ([latex]H_2C = CHCl[/latex]) molar mass of polymer ([latex]1.33 \times 10^5[/latex] g/mol) Information implied: molar mass of monomer Asked for: number of monomer units STRATEGY 1. Determine the molar mass of the monomer. 2. Divide the molar mass of polymer by the molar mass of the monomer.

a Find the repeating unit from which the polymer chain is constructed. repeating unit:[latex]\begin{matrix} H & H &\\ \mid &\mid & \\ -C- & C- \\ \mid &\mid & \\H& Cl&\end{matrix}[/latex] monomer: [latex]\begin{matrix}& H & H &\\ &\mid &\mid & \\ H-&C= & C-& Cl\end{matrix}[/latex] b 1. Molar mass of the monomer 62.49 g/mol 2. Number of units [latex]\frac{1.33 \times 10^5\> g/mol}{62.49\> g/mol} = 2.13 \times 10^3[/latex]

Question 23.1: The addition polymer polyvinyl chloride (PVC) has the struct...

Chemistry: Principles and Reactions

The addition polymer polyvinyl chloride (PVC) has the structure

\begin{matrix} H & H & H&H&H&H \\ \mid &\mid & \mid&\mid&\mid&\mid \\ -C- & C- & C-&C-&C-&C- \\ \mid &\mid & \mid&\mid&\mid&\mid\\H& Cl&H&Cl&H&Cl \end{matrix}

a Draw the structure of the monomer from which PVC is made.

b How many monomer units are in a PVC polymer that has a molar mass of $1.33 \times 10^5$ g/mol?

ANALYSISS

Information given: From part (a): monomer ( $H_2C = CHCl$ ) molar mass of polymer ( $1.33 \times 10^5$ g/mol)
Information implied: molar mass of monomer
Asked for: number of monomer units

STRATEGY

1. Determine the molar mass of the monomer.
2. Divide the molar mass of polymer by the molar mass of the monomer.

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