Which of the following are decomposition reactions?
~there can be more then one answer~
a. k2co3 (s) → k2o (s) + co2 (g)
b. 2na (s) + cl2 (g) → 2nacl (s)
c. 2lioh (s) + co2 (g) → li2co3 (s) + h2o (l)
d. 2so3 (g) → 2so2 (g) + o2 (g)

Along wire of diameter 1 mm is submerged in an oil bath of temperature ∞ 31°c. the wire has an electrical resistance per unit length of 0.01 ω/m. if a current of 103 a flows through the wire and the convection coefficient is 500 w/m2·k, what is the steady-state temperature of the wire? from the time the current is applied, how long does it take for the wire to reach a temperature that is within 1°c of the steady-state value? the properties of the wire are 8000 kg/m3, 500 j/kg·k, and 20 w/m·k.