Suatu senyawa hidrokarbon, , dibakar sempurna dengan gas oksigen menghasilkan 8,8 gram gas karbon dioksida dan 5,4 gram uap air. Jika berat molekul senyawa hidrokarbon tersebut adalah 30 g/mol, tentukan :, a. rumus empiris, b. rumus molekul, c. persamaan reaksi setara pembakaran sempurna,

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PERTANYAAN :

Suatu senyawa hidrokarbon, begin mathsize 14px style C subscript x H subscript y end style dibakar sempurna dengan gas oksigen menghasilkan 8,8 gram gas karbon dioksida dan 5,4 gram uap air. Jika berat molekul senyawa hidrokarbon tersebut adalah 30 g/mol, tentukan :
a. rumus empiris
b. rumus molekul
c. persamaan reaksi setara pembakaran sempurnaspace 

Table of Contents

Jawaban

rumus empiris dan senyawa hidrokarbon tersebut adalah begin mathsize 14px style C subscript bold 2 H subscript bold 6 end style.space 


Pembahasan

Persamaan reaksi pembakaran di atas, yaitu:

Baca Juga :  Tunjukkan reaksi di bawah ini adalah reaksi redoks atau bukan!,

begin mathsize 14px style C subscript x H subscript y and O subscript 2 yields x space C O subscript 2 plus space y space H subscript 2 O end style 

a. Berdasarkan massa atom penyusun yang diketahui, kita bisa menghitung mol atom penyusun tersebut dan diperbandingkan sehingga menghasilkan rumus empiris.
 

begin mathsize 14px style Mol space C O subscript 2 equals massa over Mr equals fraction numerator 8 comma 8 space g over denominator 44 space bevelled g over mol end fraction equals 0 comma 2 space mol Mol space H subscript 2 O equals massa over Mr equals fraction numerator 5 comma 4 space g over denominator 18 space bevelled g over mol end fraction equals 0 comma 3 space mol Mol space C O subscript 2 colon space Mol space H subscript 2 O 0 comma 2 space mol space space colon space 0 comma 3 space mol fraction numerator 0 comma 2 space mol over denominator 0 comma 2 space mol end fraction colon fraction numerator 0 comma 3 space mol over denominator 0 comma 2 space mol end fraction space space space space space space space space space space space space space 1 colon space 1 comma 5 space left parenthesis cross times 2 right parenthesis space space space space space space space space space space space space space 2 colon space 3 C subscript x H subscript y and O subscript 2 yields 2 C O subscript 2 and 3 H subscript 2 O end style  

Berdasarkan persamaan reaksi di atas didapatkan rumus empiris sebagai berikut begin mathsize 14px style C subscript 2 H subscript 6 end style. Hal ini dikarenakan jumlah atom sebelum reaksi harus sama dengan jumlah atom setelah reaksi. 

b. Rumus molekul didapatkan dari massa molekul senyawa hidrokarbon tersebut.

begin mathsize 14px style open parentheses C subscript 2 H subscript 6 close parentheses subscript n equals Mr space senyawa left parenthesis left parenthesis 2 cross times Ar space C right parenthesis plus left parenthesis 6 cross times Ar space H right parenthesis right parenthesis cross times n double bond Mr space senyawa left parenthesis left parenthesis 2 cross times 12 right parenthesis plus left parenthesis 6 cross times 1 right parenthesis right parenthesis cross times n equals 30 space begin inline style bevelled g over mol end style 30 space begin inline style bevelled g over mol end style space cross times space n equals 30 space begin inline style bevelled g over mol end style n equals 1 open parentheses C subscript 2 H subscript 6 close parentheses subscript 1 equals C subscript 2 end subscript H subscript 6 end subscript end style 

Rumus molekul sama dengan rumus empirisnya.

c. Reaksi dikatakan setara apabila jumlah atom sebelum reaksi sama dengan jumlah atom setelah reaksi.

begin mathsize 14px style C subscript 2 H subscript 6 plus begin inline style 7 over 2 end style O subscript 2 yields 2 C O subscript 2 and 3 H subscript 2 O space left parenthesis cross times 2 right parenthesis 2 C subscript 2 H subscript 6 and 7 O subscript 2 yields 4 C O subscript 2 and 6 H subscript 2 O end style 
 

Jadi, rumus empiris dan senyawa hidrokarbon tersebut adalah begin mathsize 14px style C subscript bold 2 H subscript bold 6 end style.space 

Baca Juga :  “Mother, what’s wrong with me?” cried Dewi Kadita. She clearly remembered her father, king Siliwangi of Pajajaran kingdom, praise her just a couple hours before she want to bed, “you have your mother’s beauty, my lovely daughter.” That very moment, what she saw in the mirror was the most horrible creature. Her soft skin had been replaced with disgusting brown scales, among which smelly yellowish secretion slowly emerged. Her eyes were protruding and surrounded with blackened skin. Her lips were also blackened and wrinkled. Most of her long hair was lost. She could hardly recognize herself., “Mother!” she screamed., “Yes, sweetheart, “her mother, who was still lying on her bed, turn around and faced her. Both of them screamed of the top of their voices. They looked just the same. They had been the most beautiful mother and daughter at Pajajaran but suddenly they had turned horrifying., "Mother, what has happened to us?” asked Dewi Kadita as the both cried, “I don’t know, sweetheart,” the mother said, trying to soothe her daughter, but deep inside she knew who had done this to them. Being the king’s most beautiful wife, she had caused the other wives jealous. They must have conspired against them and used some kind of black magic to deform her body and that of her daughter’s., The news spread as quickly as lightning. King Siliwangi was told that they were bad luck for the kingdom. Both the cursed women had to be exiled from the kingdom, unless the king wished the kingdom to sink into a disaster., Intimidated by the words, the king forced them to leave the kingdom that night. They left the palace with no support, no soldier guarding, no ladies – in -waiting escorting, and no golden chariot waiting, Off they walked to the neighboring kingdom, Mataram. Not knowing how to get there, they reached the southern coast of java and finally decided that they would walk along the coast to the east., On their seventh day walking, Dewi’s mother said, “I can’t stand it anymore”., “Mother, please be strong for me,” begged Dewi.” I’m sure there will be someone who can help us.”, “Leave me alone here,” her mother cried, “Go to Mataram. Try to meet King Panembahan Senapati and ask for his mercy.”, “I can’t leave you, mother,” Dewi started crying., Her mother sat on her knees. Blood flowed from her nose. Then she fell; her breath was gone., Dewi screamed, “Mother please don’t go! Please don’t.”, Out of the blue a big wave pulled her mother’s body into the ocean. Dewi ran after the body, but the southern ocean was too powerful for the girl, she ended up sitting above a rock about a kilometer from the shore. She was so exhausted that she fell asleep on it., While sleeping, she was sure that she heard her mother say. “jump into the water, sweetheart. It’s the only way to help you out of the curse.” When she woke up, with no second thought, she jumped into the sea., The violent ocean swallowed her. She was tossed about helplessly. Up, down, and twisted.” This is it” she thought. “This is the end., Only miracles could explain how amazed she was when she opened her eyes. She was in a wonderful golden palace on the bed of the ocean. She looked at herself in the mirror; she couldn’t believe what she saw. She had become more beautiful and was dressed in green, which make a remarkable contrast on her bright skin. Her hair was loose, ornamented with pearls and jasmine petals., She turned around and saw an unbelievable view; all the sea creatures were bowing to show their respect. “Long live the Queen of the South Sea,” they said. Only then, she realized that she was not a common human being anymore. The spirits and demons of the ocean had crowned her to be their queen and name her Nyai Rara Kidul which in Javanese means the beautiful majesty from the south., “King Panembahan Senapi of Mataram Kingdom is mediating on the beach, “she said to her attendants.” I will she him. Escort me there.”, The ocean was rough and displayed huge waves as Nyai Rara Kidul sat in her most beautiful gold chariot, guarded by a number of armored demon troops, heading to Parangtritis beach., She spotted the handsome king siting on a rock. As she walked towards him, the king opened his eyes. They fell in love at once, and the king asked her to be his wife., “My mighty king,” she said,” I’m honored to be your wife, but forgive me that I can’t be by your side as normal wife should for I’m the Queen of the South Sea. Nevertheless, I would be loyal not only to you but also to your descendants, the kings of Mataram . I will protect the kings and their people. But for now I want to help you conquer the Pajajaran Kingdom"., The king smiled and nodded his head. |, “May I add one thing, your majesty?, she added .” From now, I am the only one allowed to wear something green in honor of my king. “Harm ,may come upon those who wear my sacred color on the southern coast”., It’s believed for centuries, even until now that wearing the color green will in fact bring bad luck to those who visit the southern coast.To this day, people who visit the shouttern coast of java respect and fear Nyai Lara Kidul by not wearing green near the beach.


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