Grams per mole

A mole represents not only a specific number of particles but also a definite mass of a substance as represented by its formula (0,02, H20, NaCl,. . . ). The molar mass, MM, in grams per mole, is numerically equal to the sum of the masses (in amu) of the atoms in the formula. 

The units of molar mass in each case are grams per mole (g-mol ). The mass of a sample is the amount (in moles) multiplied by the mass per mole (the molar mass),... 

The mass of an atom in terms of the atomic mass constant is numerically the same as the molar mass in grams per mole. For instance, the molar mass of carbon-12 is exactly 12 g-mol, and the mass of a carbon-12 atom is exactly 12mu. 

Nuclide masses are ordinarily tabulated using units of grams per mole. Therefore, to compute HE, it is useful to rewrite Equation with energy in units of kilojoules per mole and the change in mass in grams per mole ... 

The formula weight of a substance is equal to its number of grams per mole. Avogadro s number is the number of atomic mass units in 1 g. It is defined in that manner so that the atomic weight of an element (in amu) is numerically equal to the number of grams of the element per mole. Consider helium, with atomic weight 4.0 ... 

Avogadro s number appears both in the numerator and the denominator of this expression the values reduce to a factor of 1 (they cancel out) and the numeric value in grams per mole is equal to the numeric value of the atomic weight in amu per atom. 

A similar argument leads to the conclusion that the formula weight of any element or compound is equal to the number of grams per mole of the element or compound. 

The same number, but in different units, is obtained because the number of inches in 1 foot is the same as the number in 1 dozen. Compare this process to the one above for grams per mole. 

Changing grams to moles and moles to grams is perhaps the most important calculation you will have to make all year (Fig. 4-2), Some authors use the term molar mass for the mass of 1 mol of any substance. The units are typically grams per mole. 

Ans. Ideal gas law problems involve moles. If the number of moles of gas is given or asked for, or if a quantity that involves moles is given or asked for, the problem is most likely an ideal gas law problem. Thus, any problem involving masses of gas (which can be converted to moles of gas) or molecular weights (grams per mole) or numbers of individual molecules (which can be converted to moles) and so forth is an ideal gas law problem. Problems that involve an unchanging mass of gas are most likely not ideal gas law problems. 

The liters in Equation (4.10) are the liters of solution that are desired the moles per liter is the molarity desired and the grams per mole is the formula weight of the solute. Thus, we have... 

The weight of the analyte is then calculated by multiplying by its formula weight (grams per mole) ... 

The weight (or more correctly, the mass) of a protein expressed in grams per mole of active sites. Not all oligomeric proteins, even some with identical subunits, have a number of active sites equal to the number of subunits. Enzyme normality (Le., the concentration of enzyme active sites) is typically determined by active site titration with an active-site-directed irreversible inhibitor. This is... 

Divide the given mass of solute by the number of moles calculated in Step 4. This is your molecular mass, or number of grams per mole, from which you can often guess the identity of the mystery compound. 

We also studied the effect of catalyst concentration on the reaction and determined that the reaction could take place without catalysis, but that its speed was highly dependent upon the concentration of catalyst, both in the case of 72% perchloric acid and in the case of the boron trifluoride etherate. A workable level for the perchloric acid catalyst was found to be in the order of 3-4 grams per mole of the acid-ester charge. A catalyst level for the boron trifluoride etherate of 40 grams per mole of the acid component charge was satisfactory. 

Was this youT answer From the formula mass, you know that 1 mole of water has amass of 18 grams. Therefore, the molar mass is 18 grams per mole. 

Cooking and chemistry are similar in that both require measuring ingredients. Just as a cook looks to a recipe to find the necessary quantities measured by the cup or the tablespoon, a chemist looks to the periodic table to find the necessary quantities measured by the number of grams per mole for each element or compound. 

Assuming air has an average formula mass of 28.8 grams per mole, how many grams is this ... 

Compound PKa Grams per mole d(pKa)/dT Charge on conjugate base... 

Rh cone. 5 X 10"3 at gram per mole olefin (C6H5)3P cone. 1 X 10"1 mole per mole olefin... 

Molecular weights (M,) in this text are expressed in units of grams per mole. 

Vapor density provides a useful means of molecular weight determination for substances which exert a high vapor pressure at or near room temperature. In the simplest case, an evacuated bulb of known volume is tared, filled with a measured pressure of the gas at a known temperature, and is reweighed. These pressure, temperature, and volume data yield the moles of gas (if the ideal gas law is assumed) and the additional weight data permit the calculation of (he number of grams per mole. 

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