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Note the Pattern

The molar mass of any substance is its atom mass, molecule mass, or formula fixed in grams per mole.

You are watching: Molar mass of iodine in grams



The regular table lists the atomic mass the carbon together 12.011 amu; the mean molar fixed of carbon—the massive of 6.022 × 1023 carbon atoms—is thus 12.011 g/mol:


substance (formula) Atomic, Molecular, or Formula massive (amu) Molar fixed (g/mol)
carbon (C) 12.011 (atomic mass) 12.011
ethanol (C2H5OH) 46.069 (molecular mass) 46.069
calcium phosphate 310.177 (formula mass) 310.177

The molar mass of naturally arising carbon is various from the of carbon-12 and also is not an integer due to the fact that carbon occurs together a mixture of carbon-12, carbon-13, and carbon-14. One mole that carbon still has actually 6.022 × 1023 carbon atoms, but 98.89% the those atoms are carbon-12, 1.11% space carbon-13, and a map (about 1 atom in 1012) space carbon-14. (For much more information, see ar 1.6 ) Similarly, the molar mass of uranium is 238.03 g/mol, and also the molar mass of iodine is 126.90 g/mol. As soon as we deal with elements such together iodine and sulfur, which occur as a diatomic molecule (I2) and also a polyatomic molecule (S8), respectively, molar massive usually refers to the fixed of 1 mol that atoms that the element—in this situation I and also S, not come the massive of 1 mol the molecules of the aspect (I2 and S8).

The molar massive of ethanol is the massive of ethanol (C2H5OH) that consists of 6.022 × 1023 ethanol molecules. As you calculate in instance 1, the molecular mass that ethanol is 46.069 amu. Because 1 mol that ethanol has 2 mol the carbon atom (2 × 12.011 g), 6 mol of hydrogen atom (6 × 1.0079 g), and 1 mol of oxygen atoms (1 × 15.9994 g), that is molar mass is 46.069 g/mol. Similarly, the formula fixed of calcium phosphate is 310.177 amu, so its molar fixed is 310.177 g/mol. This is the mass of calcium phosphate that consists of 6.022 × 1023 formula units.

The mole is the basis of quantitative charline-picon.comistry. It provides charline-picon.comists with a way to transform easily between the fixed of a substance and the variety of individual atoms, molecules, or formula units of the substance. Conversely, it permits charline-picon.comists to calculation the mass of a substance essential to obtain a desired number of atoms, molecules, or formula units. For example, to convert moles that a substance to mass, we usage the relationship


( (moles)(molar ; mass) ightarrow mass ag1.71 )


or, an ext specifically,

( molesleft ( dfracgramsmole ight ) = grams )​


To convert from mass to variety of particles, massive is multipled by (1/molar mass) to acquire the number of moles i beg your pardon is climate multiplied by Avogadro33 Surefire Signs My Crush Is Trying To Make Me Jealous And Likes You

The fixed of 1.75 mol the S2Cl2 is calculated as follows:

( moles; S_2Cl_2 left = mass; S_2Cl_2 )

( 1.75; mol; S_2Cl_2left ( dfrac135.036; g; S_2Cl_21;mol;S_2Cl_2 ight )=236;g; S_2Cl_2 )

B The formula fixed of Ca(ClO)2 is obtained as follows:

1Ca (1 atom )(40.078 amu/atom) = 40.078 amu
2Cl (2 atoms)(35.453 amu/atom) = 70.906 amu
2O (2 atoms)(15.9994 amu/atom) = 31.9988 amu
Ca(ClO)2 formula fixed of Ca(ClO)2 = 142.983 amu

The molar fixed of Ca(ClO)2 is 142.983 g/mol

( moles; Caleft ( ClO ight )_2left < dfracmolar; mass; Caleft ( ClO ight )_21; mol; Caleft ( ClO ight )_2 ight >=mass; Caleft ( ClO ight )_2 )

( 1.75; mol; Caleft ( ClO ight )_2left < dfrac142.983; g Caleft ( ClO ight )_21; mol; Caleft ( ClO ight )_2 ight >=250.; g; Caleft ( ClO ight )_2 )​

Exercise

Calculate the fixed of 0.0122 mol of each compound.

Si3N4 (silicon nitride), used as bearings and also rollers (CH3)3N (trimethylamine), a corrosion inhibitor

Answer: