Pada penyetaraan reaksi kimia, jumlah atom pada ruas kiri dan ruas kanan harus sama. Langkah yang digunakan untuk penyetaraan reaksi kimia yaitu:
1. Pemberian koefisien reaksi pada setiap zat
![Error converting from MathML to accessible text.](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAIcAAAARCAYAAAD32L9UAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAAAKIPF7gAAAAn9JREFUeNrtmdFHLHEUx0euJCt6SJIrkh6S9NJTksh9uJJeriQ9RZL01Ev6B5Kkh0QPSdZ1ua4kyX3pKUkkSZLLfUiSRJKsrJi+h+9qWjOzv9n9/XZnTIePtTO/nfmeM2fO7/x+a1lqZoNRn3M6zNY0JmPj4BCkwAGYsMJrJuJbNP9FYBLURyA5ysAuWAC1PCaf8zxeFtLk0BXfovtv8wbJCCTHDFjxOLcKZg083C3QEpL4ave/HxyBNLgGwx4C5fhIiZPjG/gPHsGQy5hTnwclx88MJMckeOLbmvAZ1wR+U/ukofhq9/+n44JdFO8lMOkoV4Ukh62A229+ga8sj0ugM2tMOkfJTeWp97ui5iOPBOkA25w65Pyyofia8t9TkPO7CN8IybRSBfaKHRwXm2LlkHm90mPMMStHLr8Kja92/xsoSBx8zZEcFkvfcEh6jheXstrq8Xs5flKiniMdwK9C4qvd/3Mw7ch6W+GhZMqf81wf2Gcg9tkYJQwmR72Ls9NsvLwashlNeoPaP9AYwPd84xvEf6Xp/Bm0sez0ObpnP/F1YC3r3A7odiyXZO3+R3NyzIFqUMFeqVdhKSdaF8Ff8EWT3nx6ll1qKacfJuIbxH+lqiQl7IHM8kJ3ChcZyXED3XO8THs/wAW4Aj0+Yyc4z2fesjHFPYKUZc6a+YBvs1YlJuKr4r9tldAauOyMisVNb0mTQ5ZuAxEKdtz02qwsN5yi24shOsGb9UckyHHXW8kkO3Hp4bRaLTeqmiIS6E+971bDpbARk1XEJj+jYJ96P5psKl6anANbIzZnx1nvOptai3swspk3aEq86n8kYbG465V9kns2pdJvfPgj8w3oHQLiwl0EQgAAAax0RVh0TWF0aE1MADxtYXRoIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8xOTk4L01hdGgvTWF0aE1MIiBjbGFzcz0id3JzX2NoZW1pc3RyeSI+PG1zdWI+PG1pIG1hdGhzaXplPSIxNHB4Ij5hTjwvbWk+PG1uIG1hdGhzaXplPSIxNHB4Ij4yPC9tbj48L21zdWI+PG1vIG1hdGhzaXplPSIxNHB4Ij4rPC9tbz48bXN1Yj48bWkgbWF0aHNpemU9IjE0cHgiPmJPPC9taT48bW4gbWF0aHNpemU9IjE0cHgiPjI8L21uPjwvbXN1Yj48bW8gbWF0aHNpemU9IjE0cHgiPiYjeDIxOTI7PC9tbz48bXN1Yj48bWkgbWF0aHNpemU9IjE0cHgiPmNOPC9taT48bW4gbWF0aHNpemU9IjE0cHgiPjI8L21uPjwvbXN1Yj48bXN1Yj48bWkgbWF0aHNpemU9IjE0cHgiIG1hdGh2YXJpYW50PSJub3JtYWwiPk88L21pPjxtbiBtYXRoc2l6ZT0iMTRweCI+NTwvbW4+PC9tc3ViPjwvbWF0aD6U3+K5AAAAAElFTkSuQmCC)
2. Penentuan persamaan matematika berdasarkan unsur yang sama
(1)
(2)
3. Perhitungan koefisien a, b, dan c
Perhitungan koefisien a, b, dan c dilakukan dengan melakukan pemisalan pada salah satu koefisien, misal a=1, maka :
![begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 2 a end cell equals cell 2 c end cell row cell 2 left parenthesis 1 right parenthesis end cell equals cell 2 c end cell row c equals 1 end table end style](data:image/png;base64,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)
![begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 2 b end cell equals cell 5 c end cell row b equals cell fraction numerator 5 left parenthesis 1 right parenthesis over denominator 2 end fraction end cell row b equals cell 5 over 2 end cell end table end style](data:image/png;base64,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)
3. Nilai koefiesien yang telah diperoleh disubtitusikan ke persamaan reaksi kimia
![begin mathsize 14px style N subscript 2 plus 5 over 2 O subscript 2 yields N subscript 2 O subscript 5 end style](data:image/png;base64,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)
Koefisien persamaan reaksi diatas berbentuk pecahan, agar koefisien reaksi tidak berbentuk pecahan maka koefisien dikalikan dengan 2. Persamaan reaksinya adalah sebagai berikut:
![begin mathsize 14px style 2 N subscript 2 and 5 O subscript 2 yields 2 N subscript 2 O subscript 5 space end style](data:image/png;base64,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)
4. Pemeriksaan jumlah atom di ruas kiri dan kanan
![](https://imgix2.ruangguru.com/assets/miscellaneous/jpg_bshnzb_8876.JPG)
Tabel diatas menunjukkan bahwa jumlah atom diruas kiri dan kanan sudah setara, sehingga persamaan reaksi sudah setara.
Jadi, persamaan reaksi yang yang sudah setara adalah sebagai berikut:
![undefined](data:image/png;base64,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)