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Sebanyak 249,5 gram kristal C u S O 4. ​ x H 2 ​ O dipanaskan sehingga menghasilkan 159,5 gram C u S O 4 ​ , menururt reaksi: C u S O 4. ​ x H 2 ​ O ( s ) → C u S O 4 ​ ( s ) + x H 2 ​ O ( g ) Rumus senyawa kristal tersebut adlah .... (Ar Cu=63,5; S=32; O=16; H=1)

Sebanyak 249,5 gram kristal dipanaskan sehingga menghasilkan 159,5 gram , menururt reaksi:

Rumus senyawa kristal tersebut adlah .... (Ar Cu=63,5; S=32; O=16; H=1)

  1. C u S O subscript 4. end subscript space 4 space H subscript 2 O

  2. C u S O subscript 4. end subscript space 5 space H subscript 2 O

  3. C u S O subscript 4. end subscript space 6 space H subscript 2 O

  4. C u S O subscript 4. end subscript space 7 space H subscript 2 O

  5. C u S O subscript 4. end subscript space 8 space H subscript 2 O

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A. Ratna

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Mahasiswa/Alumni Universitas Negeri Malang

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M a s s a space h i d r a t space left parenthesis C u S O subscript 4. x H subscript 2 O right parenthesis space a d a l a h space 249 comma 5 space g r a m comma space s e t e l a h space d i p a n a s k a n space t e r s i s a space 159 comma 5 g r a m comma space i n i space m e r u p a k a n space m a s s a space g a r a m space a n h i d r a t space left parenthesis C u S O subscript 4 right parenthesis.  M a s s a space y a n g space h i l a n g space k a r e n a space p e m a n a s a n space i n i space m e r u p a k a n space m a s s a space H subscript 2 O comma space d i m a n a space m a s s a space H subscript 2 O space a d a l a h space s e l i s i h space a n t a r a space m a s s a space h i d r a t space d e n g a n space a n h i d r a t comma space  y a i t u equals 249 comma 5 – 159 comma 5 equals 90 space g r a m.  K e m u d i a n comma space u n t u k space m e n e n t u k a n space j u m l a h space H subscript 2 O space m a k a space h i t u n g space p e r b a n d i n g a n space m o l space d a r i space H subscript 2 O space d a n space g a r a m.  m o l space C u S O subscript 4 colon M o l space H subscript 2 O equals fraction numerator m a s s a C u S O 4 over denominator M r C u S O 4 end fraction colon fraction numerator m a s s a H subscript 2 O over denominator M r H subscript 2 O end fraction  equals fraction numerator 159 comma 5 g r a m over denominator 159 comma 5 end fraction colon 90 over 18  equals 1 colon 5  S e h i n g g a space X space a d a l a h space 5  M a k a space r u m u s space h i d r a t n y a equals C u S O subscript 4.5 H subscript 2 O

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