Calculate the number of moles of carbon atoms present in...

Calculate the number of moles of carbon atoms present in each of the following samples. a. $1.271 \mathrm{g}$ of ethanol, $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$ b. $3.982 \mathrm{g}$ of 1,4 -dichlorobenzene, $\mathrm{C}_{6} \mathrm{H}_{4} \mathrm{Cl}_{2}$ c. 0.4438 g of carbon suboxide, $\mathrm{C}_{3} \mathrm{O}_{2}$ d. $2.910 \mathrm{g}$ of methylene chloride, $\mathrm{CH}_{2} \mathrm{Cl}_{2}$

Calculate the number of moles of carbon atoms present in each of the following samples.
a. $1.271 \mathrm{g}$ of ethanol, $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$
b. $3.982 \mathrm{g}$ of 1,4 -dichlorobenzene, $\mathrm{C}_{6} \mathrm{H}_{4} \mathrm{Cl}_{2}$
c. 0.4438 g of carbon suboxide, $\mathrm{C}_{3} \mathrm{O}_{2}$
d. $2.910 \mathrm{g}$ of methylene chloride, $\mathrm{CH}_{2} \mathrm{Cl}_{2}$

Key Concepts

Chemical Formula Interpretation

Interpreting chemical formulas involves understanding the composition of a compound through the symbols and subscripts that indicate the number and types of atoms present. This skill is necessary to determine the contribution of individual elements within a compound, such as counting the number of carbon atoms per molecule.

Stoichiometry

Stoichiometry is the area of chemistry that deals with the quantitative relationships between reactants and products in chemical reactions. It involves the use of mole ratios derived from chemical formulas to convert between amounts of different substances, such as determining the number of moles of a specific element in a given mass of a compound.

Mole Concept

The mole is a fundamental unit in chemistry that represents a specific quantity of particles, usually atoms or molecules, equivalent to Avogadro's number (approximately 6.022 x 10^23). It serves as a bridge between the atomic scale and the macroscopic measurements in the lab, allowing chemists to count particles by weighing them.

Molar Mass Calculation

Molar mass is the mass of one mole of a substance and is calculated by summing the atomic masses of all atoms in a molecule as given by its chemical formula. It is crucial for converting between the mass of a substance and the number of moles, which is a common requirement in quantitative chemical analysis.

Transcript

00:01 So you're to calculate number ma.

00:02 Also be carbon atoms in each case, so forced when they provided one point 271 g off eternal eternal winner that mueller mass off eternal is 46 g.

00:20 So 46 g off eternal consist off to mold soap.

00:24 Carmen um allsop carbon andi therefore, 1.271 grandma fifth in all consist off.

00:34 How many moles? so car also carbon and therefore moles off carbonate.

00:44 Um, that is equal to 1.271 in two, divided by 46 on that comes to be find not for you for you 26 on their moles once so therefore mall sof carbon atom that is equal to 0.55 to 6 months malls then second case also your toe calculate yeah, me.

01:37 So be case 14 no miguez that is three point my name 29 g off 14 dickler romancing bye clara benson now and all muller mass off 14 dyke laura benson is 1 47 graham so 1 41 47 grandma one for dyke lower advancing consist six small of carbonated six small off carbon atoms therefore 3.9289 g off one full dyke, laura benson consist off x small off carbon atoms x smaller carbon atoms and therefore therefore oh, nemerov mall soft carbon.

02:58 Yeah, that is equal toe.

03:01 Three points 982 into six.

03:07 Divided by one 47th imed that comes 0.16253 three modish off carbonate.

03:24 Um, therefore, number off mole soft carbonate.

03:33 Um, carbon item that is a cult toe 0.16 who fired three models.

03:49 So the sort you would answer then hard the provider point plaind 4438 grandma off.

04:16 Yeah, dry mouth.

04:20 Carbon sell.

04:21 Folks say carbon.

04:24 Some outside that is c three or two.

04:27 So we know the mueller mass off carbons of oxide is 78...