*





Note the Pattern

The molar mass of any type of substance is its atomic mass, molecular mass, or formula mass in grams per mole.

You are watching: What is the formula mass of ethyl alcohol c2h5oh



The periodic table lists the atomic mass of carbon as 12.011 amu; the average molar mass of carbon—the mass of 6.022 × 1023 carbon atoms—is therefore 12.011 g/mol:


Substance (formula) Atomic, Molecular, or Formula Mass (amu) Molar Mass (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 normally emerging carbon is various from that of carbon-12 and is not an integer because carbon occurs as a mixture of carbon-12, carbon-13, and carbon-14. One mole of carbon still has actually 6.022 × 1023 carbon atoms, however 98.89% of those atoms are carbon-12, 1.11% are carbon-13, and also a map (around 1 atom in 1012) are carbon-14. (For more information, see Section 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. When we resolve elements such as iodine and sulhair, which take place as a diatomic molecule (I2) and also a polyatomic molecule (S8), respectively, molar mass usually describes the mass of 1 mol of atoms of the element—in this instance I and S, not to the mass of 1 mol of molecules of the facet (I2 and S8).

The molar mass of ethanol is the mass of ethanol (C2H5OH) that consists of 6.022 × 1023 ethanol molecules. As you calculated in Example 1, the molecular mass of ethanol is 46.069 amu. Due to the fact that 1 mol of ethanol consists of 2 mol of carbon atoms (2 × 12.011 g), 6 mol of hydrogen atoms (6 × 1.0079 g), and 1 mol of oxygen atoms (1 × 15.9994 g), its molar mass is 46.069 g/mol. Similarly, the formula mass of calcium phosphate is 310.177 amu, so its molar mass is 310.177 g/mol. This is the mass of calcium phosphate that includes 6.022 × 1023 formula systems.

The mole is the basis of quantitative yellowcomic.comisattempt. It gives yellowcomic.comists through a way to convert quickly in between the mass of a substance and also the variety of individual atoms, molecules, or formula devices of that substance. Conversely, it enables yellowcomic.comists to calculate the mass of a substance needed to attain a preferred number of atoms, molecules, or formula units. For instance, to convert moles of a substance to mass, we usage the relationship


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


or, more specifically,

( molesleft ( dfracgramsmole est ) = grams )​


To convert from mass to number of pposts, mass is multipled by (1/molar mass) to get the variety of moles which is then multiplied by AvogadroSimple Solutions Math Answers Grade 6, Simple Solutions Resource Center

The mass of 1.75 mol of 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 mass of Ca(ClO)2 is derived 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 mass of Ca(ClO)2 = 142.983 amu

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

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

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

Exercise

Calculate the mass of 0.0122 mol of each compound.

Si3N4 (silsymbol nitride), supplied as bearings and rollers (CH3)3N (trimethylamine), a corrosion inhibitor

Answer: