Oleh: jalancerdas | Mei 23, 2007

.Garam Kristal

`Garam Kristal

Jika 38 gram MgSO4.XH2O dipanaskan menghasilkan 20 gram garam anhidrat Mr MgSO4 = 120 dan Mr H2O =18 harga X diatas adalah

Penyelesaian:

MgSO4.XH2O \Longrightarrow MgSO4 + X H2O

MgSO4.XH20   = 38 gram

MgSO4 = 20 gram

__________________ _

xH2O             = 18 gram

Mol MgSO4 = \frac{20}{120} = \frac{1}{6} mol

Mol H2O = \frac{18}{18} = 1 mol

Perbandingan koefisien reaksi =perbandingan mol yang bereaksi

\frac{Mol H2O}{Mol MgSO4} = \frac{X}{1}

\frac{1}{1/6} = \frac{X}{1}

x = 6

Jurus Super CEPAT

X =\frac{18/18}{20/120}

X = 6

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