Calculate the equivalent weight of following assuming molecular weight M
(i) `H_(3)BO_(3)`
(ii) `H_(3)PO_(2)`
(iii) `FeSO_(4).(NH_(4))_(2).6H_(2)O`
(iv) `K_(2)SO_(4)Cr_(2)(SO_(4))_(3).24H_(2)O`
(v) `Al_(2)O_(3)`
(vi) `HNO_(3)`
(vii) `MgCO_(3)`
(Viii) `CaSO_(4)`