What is the percent by mass of nahco3 in a solution containing 20.0 g of nahco3 dissolved in 600.0 ml of water

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

Under which circumstances are kp and kc equal for the reaction aa(g)+bb(g)⇌cc(g)+dd(g)?

Pls i will do pls imma diewhat forms white light? (4 points)a. combination of all wavelengths of ultraviolet light b. combination of all wavelengths of visible lightc. absorption of electromagnetic waves d. absorption of infrared rays