Question

which chemical formula is correct? Ag9CH3CO2)2, K2(CN), Fe(OH)2, or MgHCO3

Answer 1

probably MgHCO3

Answer 2

no fe(oh)2 is the correct one
mg has valency of 2 its mg(hco3)2

Answer 3

using oxidation numbers:

Mg = 2+

H = +1
C = 4+
0 = 3 x -2 = -6
total for HCO3 = -1

so we need 2 * HCO3 to balance with the Mg

Answer 4

ash plz close these questions when you are happy by clicking the good question box