Chemie Alkane?

Wie viel Oktan wurde vollständig verbrannt, wenn 10 g Kohlenstoffdioxid entstanden sind. 

Kennt irgendjemand sich mit der unvollständigen Verbrennung von Alkanen aus und weiß, wie man diese Frage lösen kann?

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GrudgingOldMan
2 years ago

The molar mass of CO2 is 44 g/mol, i.e. 10 grams of CO2 10/44=0.23 mol.

8 CO2 molecules are now formed on 1 octane molecule. So we expect 0.23 mol/8= 0.028 mol octane. The molar mass of octane is 114.23 g/mol.

114.23 g/mol x 0.028 mol = 3.24 g

GrudgingOldMan
2 years ago
Reply to  eli123859

There are almost 13 O2

LeBonyt
2 years ago

C8H18 (Octan) + 12.5 O2 (Oxygen) → 8 CO2 (Carbon dioxide) + 9 H2OWater)

Incineration 1 mol of octane produces 8 mol of CO2. The mass number of CO2 is known, namely 10 g.

Tiffanylegtlos
2 years ago
Reply to  eli123859

10 g CO2 should tell you something.

Then look at the reaction equation.

You understand how much grams of octane are necessary for this.

It’s about the situation.