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Diketahui massa atom relatif open parentheses A subscript r close parentheses dari beberapa tom di bawah ini:

H=1, O=16, N=14, C=12, S=32, Na=23, K=39, Ca=40, Cl=35,5 

Tentukan massa dari 2 mol N H subscript bold 3!space 

L. Avicenna

Master Teacher

Mahasiswa/Alumni Institut Teknologi Bandung

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Pembahasan

table attributes columnalign right center left columnspacing 0px end attributes row cell mol space N H subscript 3 end cell equals cell fraction numerator massa space N H subscript 3 over denominator M subscript r space N H subscript 3 end fraction end cell row cell massa space N H subscript 3 end cell equals cell mol space N H subscript 3 cross times M subscript r space N H subscript 3 end cell row cell massa space N H subscript 3 end cell equals cell mol space N H subscript 3 cross times left curly bracket left parenthesis 1 cross times A subscript r space N right parenthesis plus left parenthesis 3 cross times A subscript r space H right parenthesis right curly bracket end cell row cell massa space N H subscript 3 end cell equals cell 2 space mol cross times left curly bracket left parenthesis 1 cross times 14 space gram space mol to the power of negative sign 1 end exponent right parenthesis plus left parenthesis 3 cross times 1 space gram space mol to the power of negative sign 1 end exponent right parenthesis right curly bracket end cell row cell massa space N H subscript 3 end cell equals cell 2 space mol cross times 17 space gram space mol to the power of negative sign 1 end exponent end cell row cell massa space N H subscript 3 end cell equals cell 34 space gram end cell end table  

Jadi massa dari 2 mol N H subscript bold 3 adalah 34 gram. 

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