Molecular molar mass

Divide the molecular molar mass by the simplest molar mass to determine the number of simplest formula units contained in the molecular formula ... 

B) Show that the sum of two atomic molar masses of Mg plus one molecular molar mass of O2 is equal to two formula molar masses of MgO. 

Titanium dioxide [13463-67-7], chemical formula TiO and relative molecular molar mass of 79.8788, occurs in nature in three polymorphic crystal forms anatase, rutile, and brookite. Moreover, under high pressure, the structure of all three polymorphs of titanium dioxide may be converted into that of a-PbO. The main properties of the three polymorphs are... 

The molecular molar mass or simply the molar mass, denoted M, corresponds to the mass per amount of substance of the macromolecule. For a macromolecule containing a number n of monomer units or residues R its molar mass is simply given by ... 

The relative molecular molar mass or simply the relative molar mass, denoted (formerly the molecular weight, MW) is a dimensionless quantity that corresponds to the ratio of the mass of the macromolecule to 1/12 of the mass of an atom of the nuclide C. It is the most important property of a macromolecule, because it is directly related to its physical... 

The theoretical density, p, expressed in kg.m of a crystal having a number Z of entities with atomic (or molecular) molar mass M, expressed in kg.mol , placed in a space lattice structure having a unit cell of volume Y, expressed in m is given by the following equation, where AT, is Avogadro s number (i.e., 6.0221367 x 10 mol ) ... 

PMMA). Under these conditions, some inevitable peaks are observed in the low molar mass range. This area starts for an elution volume of Mpmma of about 600. Enclosing a further column for this low molecular size range generally improves the separation, but the elution sequence of oligomer and disturbing peaks remains constant. 

As you will see shortly, the formula of a compound can be used to determine the mass percents of the elements present. Conversely, if the percentages of the elements are known, the simplest formula can be determined. Knowing the molar mass of a molecular compound, it is possible to go one step further and find the molecular formula. In this section we will consider how these three types of calculations are carried out. 

The molar mass of acetic acid, as determined with a mass spectrometer, is about 60 g/mol. Using that information along with the simplest formula found in Example 3.6, determine the molecular formula of acetic acid. 

Dimefoylhydrazine, foe fuel used in foe Apollo lunar descent module, has a molar mass of 60.10 g/mol. It is made up of carbon, hydrogen, and nitrogen atoms. The combustion of 2.859 g of the fuel in excess oxygen yields 4.190 g of carbon dioxide and 3.428 g of water. What are foe simplest and molecular formulas for dimefoylhydrazine ... 

It follows that the simplest formula is QH O, which has a molar mass of 58.1 g/moL Clearly the molecular formula is also the simplest formula, C3H 0. 

Effect of Molar Mass on Boiling Points of Molecular Substances... 

Table 21.1 (p. 556) lists some of the properties of the eight nonmetals considered in this chapter. Notice that all of these elements are molecular those of low molar mass (N2> 02, F2> Cl2) are gases at room temperature and atmospheric pressure (Figure 21.2, p. 556). Stronger dispersion forces cause the nonmetals of higher molar mass to be either liquids (Br2) or solids (I2, P4. S8). 

By definition, the molar mass of the end groups should be included in the molecular weight of a polymer but the corresponding quantity is not included in the degree of polymerization. 

In this book, in accord with common usage, we use the term molecular weight rather than molar mass when referring to polymers. 

Molar mass boosting, 89 Molecular composites, polyimide, 269 Molecular structure, of polyurethanes, 209-217... 

The molar mass of a molecular compound is the mass per mole of its molecules. The molar mass of an ionic compound is the mass per mole of its formula units. 

---