Suatu zat bermassa 5,3 gram dilarutkan ke dalam 500 gram air. Larutan yang terbentukdapat membeku pada suhu , . Tentukan , zat tersebut jika tetapan penurunantitik beku molal (, ) air , .

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Baca Juga :  Dear Jonathan,, Hello! How are you? I received your letter today. I am very excited to hear that you are coming to stay with me for the holidays. I am sure we will have a lot of fun together., My parents have agreed to let you stay with me. They offered to pick you up at the airport. All you have to do is to tell us when you are coming., I will now tell you about some of the things you will experience here in Indonesia. You do not have to worry about the local spicy food. We have a lot of fast‑food restaurants here like the ones you have in England., You can also shop for souvenirs to bring home. Sarinah or Blok‑M are our famous shopping areas. They have many shops selling all kinds of things. I am sure you will love them., I am also planning to take you to a few tourist spots like miniature of Indonesia, National monument, or Safari Garden. We can also go to the Ancol beach where you can swim, play on the beach, and have picnics., My family and I are looking forward to your coming. I hope to hear from you soon. Good bye., With love,, Nadim

PERTANYAAN:


Suatu zat bermassa 5,3 gram dilarutkan ke dalam 500 gram air. Larutan yang terbentuk dapat membeku pada suhu negative sign 0 comma 576 degree C. Tentukan italic M subscript r zat tersebut jika tetapan penurunan titik beku molal (K subscript f) air 1 comma 86 begin inline style bevelled fraction numerator degree C over denominator molal end fraction end style.

Jawaban

jawaban yang benar italic M subscript italic r zat adalah bold 34 bold space italic g bold space bold mol to the power of bold minus sign bold 1 end exponent.


Sebagai langkah awal, menentukan penurunan titik beku larutan

table attributes columnalign right center left columnspacing 0px end attributes row cell increment T subscript f end cell equals cell Tf degree minus sign Tf end cell row blank equals cell 0 degree C minus sign left parenthesis minus sign 0 comma 576 degree C right parenthesis end cell row blank equals cell 0 comma 576 degree C end cell end table

Selanjutnya, menentukan Mr dari perhitungan molalitas, diasumsikan larutan tersebut merupakan larutan non-elektrolit tanpa faktor Van Hoff.

Baca Juga :  Bagaimana cara meningkatkan HARGA DIRI

table attributes columnalign right center left columnspacing 0px end attributes row cell increment T subscript f end cell equals cell K subscript f cross times open parentheses m subscript zat over M subscript r cross times 1000 over m subscript air close parentheses end cell row cell 0 comma 576 end cell equals cell 1 comma 86 cross times open parentheses fraction numerator 5 comma 3 over denominator M subscript r end fraction cross times 1000 over 500 close parentheses end cell row cell 0 comma 576 end cell equals cell fraction numerator 19 comma 716 over denominator M subscript r end fraction end cell row cell M subscript r end cell equals cell 34 space g space mol to the power of negative sign 1 end exponent end cell end table 

Jadi, jawaban yang benar italic M subscript italic r zat adalah bold 34 bold space italic g bold space bold mol to the power of bold minus sign bold 1 end exponent.


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Baca Juga :  , We have been brought up for fear of insects. We regard them as unnecessary creatures that do more harm than good. Man continually wages war on them, for they not only contaminate his food and carry diseases but also devour his crops. They either sting or bite without provocation; they both fly uninvited into our roomson dry-season nights and beat against ourlighted windows. We live in dread not only of unpleasant insects like spiders or wasps,but also of quite harmless ones like moths., Reading about them increasesour understanding without dispelling our fears. Knowing that the industrious ants live in a highly organized society does nothing to prevent us from being filled with revulsion when we find hordes of them crawling overa carefully prepared picnic lunch. No matter how much we like honey, or how much we have read about the uncanny sense of direction which bees possess, we have a horror of being stung. Most of our fears are unreasonable, but they are impossible to erase. At the same time, however, insects are strangely fascinating. We enjoy reading about them, especially when we find that, like the praying mantis, they lead perfectly horrible lives. We enjoy staring at them, entranced as they go about their business, unaware (we hope) of our presence. Who has not stood in awe at the sight of a spider pouncing on a fly, or a column of ants triumphantly bearing home an enormous dead beetle?, Last dry season I spent days in the garden watching thousands of ants crawling up the trunk of my prize peach tree. The tree has grown against a warm wall on a sheltered side of the house. I am especially proud of it, not only because it has survived several draughts, but because it occasionally produces luscious peaches. During the dry season, I noticed that the leaves of the tree were beginning to wither. Cluster oftiny insects called aphides were to be found on the underside of the leaves. They were visited by a large colony of ants which obtained a sort of honey from thein. I immediately embarked on an experiment which, even though it failed to get rid of the ants, kept me fascinated for twenty-four hoursI bound the base of the tree with sticky tape, making it impossible for the ants to reach the aphides. The tape was so sticky that they did not dare to cross it. For a long time, I watched them scurrying around the base of the tree in bewilderment. I even went out at midnight with a torch and noted with satisfaction (and surprise) that the ants were still swarming around the sticky tape without being ableto do anything about it. I got up early next morning hoping to find that the ants had given up in despair. Instead, I saw that they had discovered a new route. They were climbing up the wall of the house and then on to the leaves of the tree. I realized sadly that I had been completely defeated by their ingenuity. The ants had been quick to find an answer to my thoroughly unscientific methods.

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