Pada 680°C fosfin terdekomposisi menurut reaksi: PH3(g) → P4(g) + H2(g) (belum setara). Ketika laju pembentukan PH3 adalah 1,98 × 10^−4 M.s^−1, laju berkurangnya gas P4 adalah …

Pada 680°C fosfin terdekomposisi menurut reaksi:
PH3(g) → P4(g) + H2(g) (belum setara).
Ketika laju pembentukan PH3 adalah 1,98 × 10^−4 M.s^−1, laju berkurangnya gas P4 adalah …
(A) 1,98 × 10^−4 M. s^−1
(B) 0,5 × 10^−4 M. s^−1
(C) 8,91 × 10^−4 M. s^−1
(D) 1,98 × 10^−2 M. s^−1
(E) 8,91 × 10^−2 M. s^−1

Jawaban yang benar adalah (B) 0,5 x 10^-4 M/s

Laju reaksi (v) dapat diartikan sebagai laju berkurangnya konsentrasi reaktan per satuan waktu dan laju bertambahnya konsentrasi produk per satuan waktu.

Persamaan reaksi setara :
4PH3(g) → P4(g) + 6H2(g)

Menentukan laju berkurangnya gas P4
Untuk menentukan laju berkurangnya gas P4, gunakan konsep perbandingan koefisien = perbandingan laju reaksi, sehingga dengan menggunakan data laju pembentukan PH3 dapat ditentukan laju berkurangnya gas P4.

v P4 = koefisien P4/koefisien PH3 x v PH3
v P4 = 1/4 x 1,98 × 10^−4 M/s
v P4 = 4,95 x 10^-5 M/s
v P4 = 5 x 10^-5 M/s
v P4 = 0,5 x 10^-4 M/s

Dengan demikian, laju berkurangnya gas P4 adalah 0,5 x 10^-4 M/s.

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