Calculate the molar mass for each of the following...

Calculate the molar mass for each of the following substances. a. adipic acid, $\mathrm{C}_{6} \mathrm{H}_{10} \mathrm{O}_{4}$ b. caffeine, $\mathrm{C}_{8} \mathrm{H}_{10} \mathrm{N}_{4} \mathrm{O}_{2}$ c. eicosane, $\mathrm{C}_{20} \mathrm{H}_{42}$ d. cyclohexanol, $\mathrm{C}_{6} \mathrm{H}_{11} \mathrm{OH}$ e. vinyl acetate, $\mathrm{C}_{4} \mathrm{H}_{6} \mathrm{O}_{2}$ f. dextrose, $\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}$

Calculate the molar mass for each of the following substances.
a. adipic acid, $\mathrm{C}_{6} \mathrm{H}_{10} \mathrm{O}_{4}$
b. caffeine, $\mathrm{C}_{8} \mathrm{H}_{10} \mathrm{N}_{4} \mathrm{O}_{2}$
c. eicosane, $\mathrm{C}_{20} \mathrm{H}_{42}$
d. cyclohexanol, $\mathrm{C}_{6} \mathrm{H}_{11} \mathrm{OH}$
e. vinyl acetate, $\mathrm{C}_{4} \mathrm{H}_{6} \mathrm{O}_{2}$
f. dextrose, $\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}$

Key Concepts

Stoichiometry

Stoichiometry involves using relationships between reactants and products in chemical reactions. Accurately computed molar masses enable precise calculations of these proportions, underpinning quantitative analysis in chemistry.

Molar Mass Calculation

Molar mass is determined by multiplying the atomic mass of each element by the number of atoms of that element in the molecule and summing the results. The outcome, typically expressed in grams per mole (g/mol), is crucial for converting between moles and grams in chemical calculations.

Chemical Formulas

Chemical formulas represent the types and numbers of atoms in a compound. They are essential for determining how many of each element is present, which is the first step in computing the molar mass.

Atomic Masses

Atomic masses are the masses of atoms of elements, usually expressed in atomic mass units (amu) or grams per mole. They provide the conversion factor needed to turn the count of atoms into a mass value.

Transcript

00:01 All right, so here we have six compounds.

00:06 We are just simply asked to find the molar mass.

00:11 All right.

00:12 So first off, we have adipic acid.

00:16 These are all organic compounds, by the way, because they have carbon and oxygen.

00:23 So the weight that we find the molar mass of these compounds is by summing up the molar mass of each individual.

00:34 One by one right okay so i'm also going to do a lot of rounding so that this won't take too much of our time okay and all of these figures i'm about to list are in units of grams per mole so first off we have carbon which is 12 but because we have six carbon atoms in one molecule we must multiply this number by six next we have hydrogen which has a molar mass of basically one but because there's 10 hydrogen atoms in one molecule of adipic acid we must multiply by and oxygen has a mole mass of 16 and with the same reasoning we must multiply it's molar mass by four and if we add all of this up then we get 146 .14 if we would have included the decimals.

01:47 So yeah, that's basically the flow.

01:52 Next off, we have caffeine, one that keeps this all going.

01:59 Okay, so i'm going to make a similar table where all the numbers are in units of grams per mole.

02:06 We have carbon, hydrogen, nitrogen, nitrogen, and oxygen.

02:18 As you can see, we have eight carbon atoms, 10 hydrogen atoms.

02:32 Nitrogen has a moleimaz of basically 14, and we have four nitrogen atoms.

02:40 And for carbon oxygen, we have two atoms of it in one molecule of caffeine.

02:49 And then as soon as we add.

02:52 All of this up we get 194 .2 grams per mole next off we have i believe is pronounced icosane which is a very large alkan you've learned that yet but it's a very large number i mean very large molecule not too large but quite large so we have just carbon and hydrogen so as you can see we have 20 carbon atoms and then 42 hydrogen atoms.

03:38 Because it's molar mass is one, i'm basically multiplying one by 42 to get us that, giving us a molar mass of 282 grams per mole.

03:55 Next, we have cyclohexanol, which is a cyclic alcohol, if that makes sense.

04:08 Everything here's units of grams from all.

04:10 You have carbon, hydrogen, and oxygen.

04:16 This ohh right here is an hydroxyl group, which makes, you know, this compound an alcohol.

04:23 If that clarifies anything.

04:27 Okay.

04:28 So carbon has a mole mass of 12, and we have six carbon atoms.

04:36 And here we have 11 plus 1 hydrogen atoms.

04:41 And only one oxygen atom...