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Pada reaksi pemanasan hidrat : Na 2 ​ SO 4 ​ ⋅ x H 2 ​ O → Na 2 ​ SO 4 ​ + H 2 ​ O Bila 11 , 6 g r Na 2 ​ SO 4 ​ ⋅ x H 2 ​ O dipanaskan akan terbentuk Na 2 ​ SO 4 ​ anhidrat sebanyak 7,1 gr. Jumlahmolekul air kristal yang terkandung adalah….

Pada reaksi pemanasan hidrat :  
Bila dipanaskan akan terbentuk anhidrat sebanyak 7,1 gr. Jumlah molekul air kristal yang terkandung adalah….

  1. 3

  2. 5

  3. 6

  4. 8

  5. 10

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S. Susanti

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Mahasiswa/Alumni Universitas Jayabaya

Jawaban terverifikasi

Jawaban

rumus senyawa hidrat tersebutadalah

rumus senyawa hidrat tersebut adalah straight H subscript 2 straight C subscript 2 straight O subscript 4 times 5 space straight H subscript 2 straight O  

Pembahasan

Massa kristal hidrat = 11,6 gram Massa kristal anhidrat = 7,1 gram Massa air = 11,6 – 7,1 = 4,5 gram Maka, nilai x adalah 5. Jadi rumus senyawa hidrat tersebutadalah

Massa kristal hidrat = 11,6 gram

Massa kristal anhidrat = 7,1 gram

Massa air = 11,6 – 7,1 = 4,5 gram

Mr space Na subscript 2 SO subscript 4 space equals open parentheses 2 cross times Ar space Na close parentheses plus open parentheses 1 cross times Ar space straight S close parentheses plus open parentheses 4 cross times Ar space straight O close parentheses space space space space space space space space space space space space space space space space space space space space space space equals space open parentheses 2 cross times 23 close parentheses plus open parentheses 1 cross times 32 close parentheses plus open parentheses 4 cross times 16 close parentheses space space space space space space space space space space space space space space space space space space space space space space equals 46 space plus space 32 space plus space 64 space space space space space space space space space space space space space space space space space space space space space space equals 142 space gram divided by mol  Mr space straight H subscript 2 straight O space equals open parentheses 2 cross times Ar space straight H close parentheses plus open parentheses 1 cross times Ar space straight O close parentheses space space space space space space space space space space space space space space space space space space space space space space equals space open parentheses 2 cross times 1 close parentheses plus open parentheses 1 cross times 16 close parentheses space space space space space space space space space space space space space space space space space space space space space space equals 18 space gram divided by mol

Na subscript 2 SO subscript 4 times straight x space straight H subscript 2 straight O space rightwards arrow space space space space space space space space space space space space space space space space Na subscript 2 SO subscript 4 space space space space space space space space space space space space space space space space plus space space space space space space space space space space space space space space space space space straight H subscript 2 straight O 11 comma 6 space gram space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space 7 comma 1 space gram space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space 4 comma 5 space gram space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space fraction numerator 7 comma 1 space gram space over denominator M r space Na subscript 2 SO subscript 4 end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space fraction numerator 4 comma 5 space gram space over denominator M r space H subscript 2 O end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space fraction numerator 7 comma 1 space gram space over denominator 142 end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space fraction numerator 4 comma 5 space gram space over denominator 18 end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space 0 comma 05 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space 0 comma 25 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space 1 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space 5

Maka, nilai x adalah 5. Jadi rumus senyawa hidrat tersebut adalah straight H subscript 2 straight C subscript 2 straight O subscript 4 times 5 space straight H subscript 2 straight O  

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Sebanyak 2,1 gram kristal MgSO 4 ​ ⋅ xH 2 ​ O dipanaskan sehingga seluruh kandungan air kristal menguap.Jika berat setelah pemanasan adalah 1,2 gram maka nilai x adalah.… (Ar Mg = 24; S = 32; O = 6; H...

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