Larutan 3,7 gram suatu basa dengan rumus , , dalam 100 gram air membeku pada suhu , . Jika basa tersebut memiliki derajat ionisasi = 0,8, dan harga , maka massa atom relatif (, ) logam dalam basa tersebut adalah ….,

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Baca Juga :  Once upon a time there was an old couple who didn\t have a child. They lived in a small house near the village forest. "Please give us a child," they asked God everyday., One day, from the household Shinto altar, they heard a cute cry, "Waa! Waa!", , They looked and saw a crying baby who looked just like a little finger. "This child must be a gift from God. Thanks to God!", "We will call this child \Issumboshi\," they said., They raised Issumboshi with much care, but Issumboshi never grew bigger., "Hey, Issumboshi, do you want to be eaten by frog?" Issumboshi was always being bullied by the children of the village and often went home feeling unhappy., Grandmother would make some big rice balls and encourage him. "Eat a lot, and grow up quickly," Gradnmother said., One day, Issumboshi said, "I will go to the capital to study and become a respectable person. Then I will come back." Grandfather and Grandmother were worried about him, but Issumboshi\s mind would not be changed. At once they began to prepare for his trip., Issumboshi sheathed a needle sword in a straw case, put on a cup for a sedge hat, and started out with a chopstick staff, in high spirits., "I\m going now," Issumboshi said., "Is he safe? With such a small body?" Grandfather and Grandmother asked as they saw him off., Issumboshi went on the trip with a big wish in a small body., ... ... ..., At last Issumboshi reached the capital city and anchored under the bridge. Then he climbed up to the railing and viewed the town., "There is a fine palace over there. I shall ask them at once,", At long last Issumboshi arrived at the palace., "Excuse me, but I want to meet the feudal lord.", The lord came to the door, "What? Who\s there?", "Here I am, at your feet.", "Oh. How small! Why do you want to meet me?", "Please let me be your retainer.", "I wonder if your small body can do anything.", "I\ll stay in your pocket and guard you from all harm." When Issumboshi said so, a bee came buzzing by. "Yhaa!" Issumboshi yelled, stabbing the bee., "Bravo! I employ you. It would be good if you became the Princess\s man.", "Oh! What a cute fellow he is!" said the Princess, puting Issumboshi on her palm., "I will defend you upon my life," said Issumboshi., The Princess liked Issumboshi, and she taught him reading, writing, and various studies. Further, Issumboshi practiced fencing very hard in order to be strong., One day the Princess went out to worship at the Kiyomizu Temple. Suddenly there was a strong wind, and some demons appeared. The leader of the demons tried to grab the Princess. "Help me!" she screamed. Issumboshi tried to help her, but the demon caught him and threw him into his mouth. Issumboshi tried to help her, who was swallowed, jabbed and jabbed the demon\s stomach. The demon rolled over and spat out Issumboshi., Issumboshi jumped at the demon and stabbed his eyes. The remaining demons were frightened. They ran away in great haste, but one demon, who was left behind, trembled while holding the magic hammer., "Do you want me to stab your eyes, too?" Issumboshi asked., "Please, don\t. This is the magic hammer that will grant you a wish. I give it to you, so please spare me." And saying this, he ran off in a hurry., "Thank you, Issumboshi. You saved my life," the Princess said., "Princess, please wave this magic hammer and make a wish that I may become big," said Issumboshi. The Princess waved it and asked, "May Issumboshi become big!", And then, strangely, before her eyes, Issumboshi began to grow. He grew into a nice young man. They went back to the palace, and the Princess asked the King to let her marry Issumboshi., The Princess and Issumboshi then got married, and they invited Grandfather and Grandmother to live with them in the palace. They lived happily ever after.

PERTANYAAN:


Larutan 3,7 gram suatu basa dengan rumus B open parentheses O H close parentheses subscript 2, dalam 100 gram air membeku pada suhu negative sign 2 comma 418 space degree C. Jika basa tersebut memiliki derajat ionisasi = 0,8, dan harga K subscript f space air equals 1 comma 86 space degree C forward slash m comma maka massa atom relatif (italic A subscript r) logam dalam basa tersebut adalah ….space 

Jawaban

jawaban yang benar adalah D.


Pembahasan

Massa atom relatif unsur B dapat diketahui dari konsentrasi molal larutan tersebut. Untuk mengetahui molalitas, kita substitusikan data yang diketahui melalui rumus penurunan titik beku larutan. Diketahui titik beku larutan basa tersebut adalah negative sign 2 comma 418 space degree C, sementara titik beku air adalah 0 space degree C, sehingga penurunan titik bekunya left parenthesis increment T subscript f right parenthesis adalah 2 comma 418 space degree C. Jangan lupa, larutan B open parentheses O H close parentheses subscript 2 merupakan larutan elektrolit dengan nilai alpha equals 0 comma 8. Berikut reaksi ionisasinya:

Baca Juga :  , , Sebuah benda digantungkan pada sebuah pegas,ternyata pegas mengalami pertambahan panjangseperti yang ditunjukkan gambar. Tentukankonstanta gaya pegas tersebut!,

B open parentheses O H close parentheses subscript 2 yields B to the power of 2 plus sign and 2 O H to the power of minus sign terdapat 3 ion (n = 3)

Maka nilai faktor van Hoff (i):

i equals left parenthesis n minus sign 1 right parenthesis alpha plus 1 i equals left parenthesis 3 minus sign 1 right parenthesis 0 comma 8 plus 1 i equals 2 comma 6 

Kemudian nilai-nilai ini kita substitusikan ke dalam persamaan penurunan titik beku:

table attributes columnalign right center left columnspacing 0px end attributes row cell increment T subscript f end cell equals cell m cross times K subscript f cross times i end cell row cell 2 comma 418 end cell equals cell m cross times 1 comma 86 cross times 2 comma 6 end cell row m equals cell fraction numerator 2 comma 418 over denominator 1 comma 86 cross times 2 comma 6 end fraction end cell row m equals cell 0 comma 5 space molal end cell end table 

Molalitas merupakan jumlah mol zat terlarut tiap kilogram pelarutnya atau dapat dirumuskan:

table attributes columnalign right center left columnspacing 0px end attributes row m equals cell fraction numerator mol over denominator p space open parentheses kg close parentheses end fraction end cell row m equals cell mol cross times fraction numerator 1000 over denominator p space open parentheses g close parentheses end fraction end cell row m equals cell massa over italic M subscript r cross times fraction numerator 1000 over denominator p space open parentheses g close parentheses end fraction end cell row cell 0 comma 5 end cell equals cell fraction numerator 3 comma 7 over denominator italic M subscript r end fraction cross times 1000 over 100 end cell row cell italic M subscript r end cell equals cell fraction numerator 3 comma 7 over denominator 0 comma 5 end fraction cross times 10 end cell row cell italic M subscript r end cell equals 74 end table 

Massa molekul relatif B open parentheses O H close parentheses subscript 2 merupakan jumlah dari massa atom relatif unsur-unsur penyusunnya.

table attributes columnalign right center left columnspacing 0px end attributes row cell italic M subscript r space B open parentheses O H close parentheses subscript 2 end cell equals cell italic A subscript r space B plus 2 left parenthesis italic A subscript r space O plus italic A subscript r space H right parenthesis end cell row 74 equals cell italic A subscript r space B plus 2 left parenthesis 16 plus 1 right parenthesis end cell row 74 equals cell italic A subscript r space B plus 34 end cell row cell italic A subscript r space B end cell equals cell 74 minus sign 34 end cell row cell italic A subscript r space B end cell equals 40 end table 

Dengan demikian, massa atom relatif (italic A subscript r) logam dalam basa tersebut adalah 40.

Baca Juga :  They did not help you.

Jadi, jawaban yang benar adalah D.


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