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Sebanyak 11,6 gram senyawa hidrat N a 2 ​ S O 4 ​ x H 2 ​ O dipanaskan sampai terbentuk N a 2 ​ S O 4 ​ sebanyak 7,1 gram, menurut reaksi N a 2 ​ S O 4 ​ x H 2 ​ O ( s ) → N a 2 ​ S O 4 ​ ( s ) + x H 2 ​ O ( g ) . Jika Ar Na = 23; S = 32; O = 16; H = 1, rumus senyawa kristal tersebut adalah....

Sebanyak 11,6 gram senyawa hidrat  dipanaskan sampai terbentuk  sebanyak 7,1 gram, menurut reaksi . Jika Ar Na = 23; S = 32; O = 16; H = 1, rumus senyawa kristal tersebut adalah....

  1. begin mathsize 12px style N a subscript 2 S O subscript 4 space. space H subscript 2 O end style

  2. begin mathsize 12px style N a subscript 2 S O subscript 4 space. space 2 space H subscript 2 O end style

  3. begin mathsize 12px style N a subscript 2 S O subscript 4 space. space 3 space H subscript 2 O end style

  4. begin mathsize 12px style N a subscript 2 S O subscript 4 space. space 4 space H subscript 2 O end style

  5. begin mathsize 12px style N a subscript 2 S O subscript 4 space. space 5 space H subscript 2 O end style

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S. Lubis

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begin mathsize 12px style N a subscript 2 space S O subscript 4 space x space H subscript 2 O space open parentheses s close parentheses rightwards arrow N a subscript 2 S O subscript 4 space open parentheses s close parentheses space plus space x space H subscript 2 O space open parentheses g close parentheses  11 comma 6 space g r a m 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 g r a m    M a k a space m a s s a space x space H subscript 2 O space a d a l a h space 11 comma 6 space g r a m space – space 7 comma 1 space g r a m space equals space 4 comma 5 space g r a m.  U n t u k space m e n g e t a h u i space x comma space d i m a n a space x space a d a l a h space m o l space d a r i space H subscript 2 O space m a k a space m e n g g u n a k a n space  p e r b a n d i n g a n colon  x equals fraction numerator m o l space H subscript 2 O over denominator m o l space N a subscript 2 S O subscript 4 end fraction    m o l space H subscript 2 O equals fraction numerator g r space H subscript 2 O over denominator M r space H subscript 2 O end fraction equals fraction numerator 4 comma 5 space g r a m over denominator 18 end fraction equals 0 comma 25 space m o l  m o l space N a subscript 2 S O subscript 4 equals fraction numerator g r space N a subscript 2 S O subscript 4 over denominator M r space N a subscript 2 S O subscript 4 end fraction equals fraction numerator 7 comma 1 space g r a m over denominator 142 end fraction equals 0 comma 05 space m o l    J a d i comma  x equals fraction numerator m o l space H subscript 2 O over denominator m o l space N a subscript 2 S O subscript 4 end fraction equals fraction numerator 0 comma 25 space m o l over denominator 0 comma 05 space m o l end fraction equals 5 end style

 

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