28,6 g Na2CO3.10H2O
Ta có :
MNa2CO3.10H2O = 286 (g/mol)
=> mNa = 28,6 . \(\dfrac{23\cdot2}{286}\) = 4,6 (g)
=> mC = 28,6 . \(\dfrac{12}{286}\)= 1,2 (g)
=> mO = 28,6 . \(\dfrac{16\cdot13}{286}\)= 20,8(g)
=> mH = 28,6 . \(\dfrac{20\cdot1}{286}\)= 2(g)