Question

Tính phân tử khối của các chất sau:

\(CaCl_2\)

b)\(Al\left(OH\right)_3\)

c)\(Fe_2\left(SO_4\right)_3\)

d)\(K_{mn}O_2\)

e) \(KM_nO_4\)

 

Answer 1

\(CaCl_2=40+35,5\cdot2=111\left(dvC\right)\)

\(Al\left(OH\right)_3=27+\left(16+1\right)\cdot3=78\left(dvC\right)\)

\(Fe_2\left(SO_4\right)_3=56\cdot2+\left(32+16\cdot4\right)\cdot3=400\left(dvC\right)\)

\(KMnO_2=39+55+16\cdot2=126\left(dvC\right)\)

\(KMnO_4=39+55+16\cdot4=158\left(dvC\right)\)