Chapter 11, Problem 114A

Interpretation Introduction

Interpretation:

The molecular mass and molar mass of ${\text{UF}}_{\text{6}}$ needs to be determined.

Concept introduction:

A molecule is composed of one or more atoms. Each atom has certain atomic mass. The unit of atomic mass is amu( atomic mass unit).

Answer to Problem 114A

${\text{UF}}_{\text{6}}\text{= 352}\text{.02u and 352}\text{.02 g/mol }$

Explanation of Solution

Molecular mass is the sum of atomic masses of the atoms of element present in the molecular formula of the molecule. It represents the mass of one molecule. The molar mass of a compound is the mass of 1 mole of that compound. Unit of molar mass is g/mol. The numerical value of both molecular mass and molar mass is almost approximately same.

The molecular mass and molar mass of ${\text{UF}}_{\text{6}}$ :

${\text{UF}}_{\text{6}}\text{= atomic mass of U + ( 6}\times \text{ atomic mass of F) }$

Atomic mass of U = 238.03 u

Atomic mass of F = 18.998 u

$\begin{array}{l}{\text{UF}}_{\text{6}}\text{= atomic mass of U + ( 6× atomic mass of F) }\\ {\text{UF}}_{\text{6}}\text{= 238}\text{.03 + ( 6× 18}\text{.998) =352}\text{.02u}\end{array}$

Conclusion

Thus,

${\text{UF}}_{\text{6}}\text{= 352}\text{.02u and 352}\text{.02 g/mol }$