Chemistry, 21.04.2020 07:00 savannahworkman11

COLLEGE CHEMISTRY 35 POINTS
Determine the percent yield when 12 g of CO2 are formed experimentally from the reaction of 0.5 moles of C8H18 reacting with excess oxygen according to the following balanced equation:

2 C8H18(l) + 25 O2(g)  16 CO2(g) + 18 H2O(l)

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6.81% is the percent yield when 12 g of CO2 are formed experimentally from the reaction of 0.5 moles of C8H18 reacting with excess oxygen.

Explanation:

Data given:

mass of carbon dioxide formed = 12 grams (actual yield)

atomic mass of CO2 = 44.01 grams/mole

moles of $C_{8} H_{18}$ = 0.5

Balanced chemical reaction:

2 $C_{8} H_{18}$ + 25 $O_{2}$ ⇒ 16 C $O_{2}$ + 18 $H_{2} _O{}$

number of moles of carbon dioxide given is

number of moles = $\frac{mass}{atomic mass of 1 mole}$

number of moles= $\frac{12}{44}$

number of moles of carbon dioxide gas = 0.27 moles

from the reaction 2 moles of $C_{8} H_{18}$ reacts to produce 16 moles of C $O_{2}$

So, when 0.5 moles reacted it produces x moles

$\frac{16}{2}$ = $\frac{x}{0.5}$

x = 4

4 moles of carbon dioxide formed, mass from it will give theoretical yield.

mass = number of moles x molar mass

mass = 4 x 44.01

= 176.04 grams

percent yield = $\frac{actual yield}{theoretical yield}$ x 100

percent yield = $\frac{12}{176.04}$ x 100

percent yield = 6.81 %

Answer from: Quest

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

Answer from: Quest

You would be correct, boiling water does disinfect contamination. the property of disinfecting means to kill germs, bacteria and other pathogens or contamination that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate. the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.

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COLLEGE CHEMISTRY 35 POINTS
Determine the percent yield when 12 g of CO2 are formed experiment...

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