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MgSO₄ • xH₂O → MgSO₄ + xH₂O
massa konstan 60 gram adalah massa MgSO₄
mol MgSO₄ = massa/Mr
mol = 60/120
mol = 0,5 mol
ingat bahwa perbandingan mol = perbandinagn koefisien. Maka mol MgSO₄ • xH₂O= 0,5 mol
MR MgSO₄ • xH₂O = massa/mol
MR MgSO₄ • xH₂O = 114/0,5
MR MgSO₄ • xH₂O = 228
Mr xH₂O = Mr MgSO₄ • xH₂O - Mr MgSO₄
Mr xH₂O = 228 - 120
Mr xH₂O = 108
x = Mr xH₂O/ MrH₂O
x = 108/18
x = 6
Jadi, nilai x adalah 6