試題詳解

77. Three electrochemical cells were connected in series so that the same quantity of electrical current passes through all three cells. fn the first cell, 1.15 g of chromium metal was deposited from a chromium(III) nitrate (Cr(NO₃)₃) solution. fn the second cell, 6.31 g of osmium was deposited from a solution made of Osn+ and nitrate ions.
Choose the correct name of the salt. Cr=52.0 g/mol; Os=192.2 g/mol
(A) osmium(II) nitrate
(B) osmium(III) nitrate
(C) osmium(IV) nitrate
(D) osmium(V) nitrate
(E) osmium(VI) nitrate