Chapter 2, Problem 2.141P

(a)

Interpretation Introduction

Interpretation:

The mass percent of platinum $\left(\text{Pt}\right)$ in platinol is to be determined.

Concept introduction:

The molecular mass of a compound is defined as the sum of the atomic masses of atoms of all the elements present in it.

The general formula to calculate the molecular mass of a compound is,

$\text{Molecular mass of the compound}=\left[\begin{array}{l}\Sigma \left(\text{number of atoms of the element}\right)\\ \left(\text{atomic mass of the element}\right)\end{array}\right]$ (1)

The mass percent of an element in a compound is defined as the total concentration of the element in the compound.

The general formula to calculate the total mass of an element in a compound is,

$\text{Total mass of an element}=\left[\begin{array}{l}\left(\text{total number of atoms of the element}\right)\\ \left(\text{atomic mass of the element}\right)\end{array}\right]$ (2)

The general formula to calculate the mass percent of an element in a compound is,

$\text{Mass percent}=\left(\frac{\text{total mass of the element in the compound}}{\text{molecular mass of the compound}}\right)\left(100\right)$ (3)

(b)

Interpretation Introduction

Interpretation:

The total mass of platinol that can be made for $\$1.00\text{ million}$ is to be determined.

Concept introduction:

The law of definite composition - This law can be defined as; a particular compound maintains an exact universal proportion of elements in its composition, irrespective of the source. The proposal for this law was made by Joseph Proust.