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Sebanyak 11,6 gram senyawa hidrat N a subscript 2 S O subscript 4 space x space H subscript 2 O dipanaskan sampai terbentuk undefined sebanyak 7,1 gram, menurut reaksi :

N a subscript 2 S O subscript 4 space x space H subscript 2 O space left parenthesis s right parenthesis space rightwards arrow space N a subscript 2 S O subscript 4 space left parenthesis s right parenthesis space plus space x space H subscript 2 O space left parenthesis g right parenthesis

Jika Ar Na = 23 ; S = 32 ; O = 16 ; H =1, rumus senyawa kimia kristal tersebut adalah ......

  1. N a subscript 2 S O subscript 4. space space H subscript 2 O

  2. N a subscript 2 S O subscript 4. space 2 space H subscript 2 O

  3. N a subscript 2 S O subscript 4. space 3 space H subscript 2 O

  4. N a subscript 2 S O subscript 4. space 4 space H subscript 2 O

  5. N a subscript 2 S O subscript 4. space 5 space H subscript 2 O

M. Robo

Master Teacher

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Pembahasan

M a s s a space h i d r a t space left parenthesis N a subscript 2 S O subscript 4. x space H subscript 2 O right parenthesis space a d a l a h space 11 comma 6 space g r a m comma space k e t i k a space d i p a n a s k a n space a d a space m a s s a space h i l a n g comma space  m a s s a space y a n g space h i l a n g 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. space  K e m u d i a n space m a s s a space t e r s i s a space a d a l a h space 7 comma 1 space g r a m space i n i space m e r u p a k a n space m a s s a space a n h i d r a t space left parenthesis g a r a m space m u r n i right parenthesis.  M a s s a space H subscript 2 O space equals space m a s s a space h i d r a t space minus space m a s s a space a n h i d r a t  space space space space space space space space space space space space space space space space space space space space space space equals space 11 comma 6 space g r a m space minus space 7 comma 1 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 equals space 4 comma 5 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 N a subscript 2 S O subscript 4 space colon space m o l space H subscript 2 O space equals space fraction numerator m a s s a space N a subscript 2 S O subscript 4 over denominator M r space N a subscript 2 S O subscript 4 end fraction space colon space fraction numerator m a s s a space H subscript 2 O over denominator M r space H subscript 2 O end fraction  space space space space equals space fraction numerator 7 comma 1 over denominator 142 end fraction space colon space fraction numerator 4 comma 5 over denominator 18 end fraction  space space space space equals space 0 comma 05 space colon space 025  space space space space equals space 1 thin space colon space 5  S e h i n g g a space X space a d a l a h space 5 space  M a k a space r u m u s space h i d r a t n y a space equals space N a subscript 2 S O subscript 4.5 H subscript 2 O

 

 

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