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Massa atom relatif () H = 1 dan O = 16, tetapan Avogadro = , jumlah molekul air yang terdapat dalam 180 gram  adalah ....

Pertanyaan

Massa atom relatif (begin mathsize 14px style A subscript r end style) H = 1 dan O = 16, tetapan Avogadro = begin mathsize 14px style 6 comma 02 cross times 10 to the power of 23 end style, jumlah molekul air yang terdapat dalam 180 gram begin mathsize 14px style H subscript 2 O end style adalah ....undefined 

Pembahasan Soal:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell M subscript r space H subscript 2 O end cell equals cell left parenthesis 2 cross times A subscript r space H right parenthesis plus left parenthesis 1 cross times A subscript r space O right parenthesis end cell row blank equals cell left parenthesis 2 cross times 1 right parenthesis plus left parenthesis 1 cross times 16 right parenthesis end cell row blank equals 18 end table end style 
 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell n space H subscript 2 O end cell equals cell m over M subscript r end cell row blank equals cell fraction numerator 180 space g over denominator 18 space g space mol to the power of negative sign 1 end exponent end fraction end cell row blank equals cell 10 space mol end cell end table end style 


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell Jumlah space molekul space H subscript 2 O end cell equals cell n cross times 6 comma 02 cross times 10 to the power of 23 space molekul space mol to the power of negative sign 1 end exponent end cell row blank equals cell 10 space mol cross times 6 comma 02 cross times 10 to the power of 23 space molekul space mol to the power of negative sign 1 end exponent end cell row blank equals cell 6 comma 02 cross times 10 to the power of 24 space molekul end cell end table end style 


Jadi, jumlah molekul air yang ada begin mathsize 14px style bottom enclose bold 6 bold comma bold 02 bold cross times bold 10 to the power of bold 24 bold space bold molekul bold. end enclose end style 

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 03 April 2021

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