Chapter 9, Problem 9.129MP

(a)

Interpretation Introduction

Interpretation:

The formula for the unknown gas and the balanced reaction has to be written.

Concept Introduction:

Balancing equations:

In a reaction, the number of molecules before and after the reaction should be equal. That means the number of moles of particular compound on either side of the reaction should be equal, this can be done by multiplication with the number of molecules required to make them equal in a reaction.

(b)

Interpretation Introduction

Interpretation:

The type formula has to be identified.

Concept Introduction:

Empirical formula:

The formula giving the quantities of the elements present in a compound but not the definite numbers or arrangement of atoms.

Molecular formula:

The number of atoms of every element present in a compound.

(c)

Interpretation Introduction

Interpretation:

The two possible electronic dot structures for ${\text{C}}_{\text{4}}{\text{H}}_{\text{12}}{\text{O}}_{\text{2}}$ has to be drawn.  

Concept Introduction:

Electron-dot structure:

The valence electrons are symbolized by dots placed around the chemical symbol. Electrons are positioned up to two on each side of the elemental symbol for a maximum of eight which is the number of electrons in a filled s and p shell.

(d)

Interpretation Introduction

Interpretation:

The ${\text{ΔH}}^{\text{0}}{}_{\text{f}}$ for compound ${\text{C}}_{\text{2}}{\text{H}}_{\text{6}}\text{O}$ has to be calculated.

Concept Introduction:

Molar mass:

It is a physical property, which is defined as the mass of a given substance divided by the amount of substance. Unit of the kilogram is $\text{g/mol}$

$\text{molar mass}\text{=}\frac{\text{amount}\text{of}\text{mass}}{\text{molecular mass}}$