Which half reaction is associated with electrode A? O Cu(s) >Cu2+ (aq) + 2e-
O Cu2+ (aq) + 2e — Cu(s)
Ag(s)— Ag (aq) + em
Ag (aq) + e- Ag(s)

What overall charge must all compounds have

A5.000 g sample of niso4 h2o decomposed to give 2.755 g of anhydrous niso4. what is the formula of the hydrate? what is the full chemical name for the hydrate? what is the molar mass of the hydrate? niso4•_h2o what is the mass % of water in the hydrate?

Answer asap need it by wednesday morning calculate the ph of 0.02m hcl best answer will be brainliest