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Sebanyak 1.500 gram urea  dibuat berdasarkan reaksi berikut.       Berdasarkan data kalor pembentukan berikut.       entalpi dari proses pembuatan urea tersebut adalah ... kkal. ( urea = 60)

Pertanyaan

Sebanyak 1.500 gram urea begin mathsize 14px style left parenthesis C O open parentheses N H subscript 2 close parentheses subscript 2 right parenthesis end style dibuat berdasarkan reaksi berikut.
 

begin mathsize 14px style C O subscript 2 open parentheses italic g close parentheses and 2 N H subscript 3 open parentheses italic g close parentheses yields C O open parentheses N H subscript 2 close parentheses subscript 2 left parenthesis italic s right parenthesis plus H subscript 2 O open parentheses italic g close parentheses end style 
 

Berdasarkan data kalor pembentukan berikut.
 

begin mathsize 14px style increment H subscript f degree space C O subscript 2 open parentheses italic g close parentheses equals minus sign 94 comma 05 space kkal space mol to the power of negative sign 1 end exponent increment H subscript f degree space N H subscript 3 open parentheses italic g close parentheses equals minus sign 11 comma 04 space kkal space mol to the power of negative sign 1 end exponent increment H subscript f degree space H subscript 2 O open parentheses italic g close parentheses equals minus sign 57 comma 80 space kkal space mol to the power of negative sign 1 end exponent increment H subscript f degree space C O open parentheses N H subscript 2 close parentheses subscript 2 left parenthesis italic s right parenthesis equals minus sign 79 comma 63 space kkal space mol to the power of negative sign 1 end exponent end style 
 

entalpi dari proses pembuatan urea tersebut adalah ... kkal. (begin mathsize 14px style M subscript r end style urea = 60)space 

  1. -532,5undefined 

  2. -3.195,0undefined 

  3. -1.102,5undefined 

  4. -808,5undefined 

  5. -726,1undefined 

Pembahasan Soal:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell increment H end cell equals cell sum with blank below and blank on top increment H subscript produk minus sign sum with blank below and blank on top increment H subscript reaktan end cell row blank equals cell left parenthesis increment H subscript f degree space C O open parentheses N H subscript 2 close parentheses subscript 2 plus increment H subscript f degree space H subscript 2 O right parenthesis minus sign left parenthesis increment H subscript f degree C O subscript 2 plus 2 left parenthesis increment H subscript f degree N H subscript 3 right parenthesis right parenthesis end cell row blank equals cell left parenthesis minus sign 79 comma 63 plus left parenthesis minus sign 57 comma 80 right parenthesis right parenthesis minus sign left parenthesis minus sign 94 comma 05 plus 2 left parenthesis minus sign 11 comma 04 right parenthesis right parenthesis end cell row blank equals cell negative sign 137 comma 43 minus sign left parenthesis minus sign 116 comma 13 right parenthesis end cell row blank equals cell negative sign 21 comma 3 space kkal forward slash mol end cell end table end style   

Menghitung massa urea

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row n equals cell massa over italic M subscript italic r end cell row blank equals cell fraction numerator 1500 space gram over denominator 60 space gram forward slash mol end fraction end cell row blank equals cell 25 space mol end cell end table end style 

Menghitung entalpi untuk 25 mol urea:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell increment H end cell equals cell left parenthesis minus sign 21 comma 3 space kkal forward slash mol right parenthesis cross times 25 space mol end cell row blank equals cell negative sign 532 comma 5 space kkal end cell end table end style   

Jadi, jawaban yang tepat adalah A. 

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 03 Februari 2021

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