The rate constant of a second-order reaction is 3.86 x 10−2 M-1 s-1. If the concentration of reactant A is 0.160 M after 75.6 sec, what was the initial concentration, [A]o? (Assume the reaction is A → B + C)

What produces wave a)sound b) heats c)transfer of energy d)vibrations

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

Answer asap need it by wednesday morning carry out the following calculations on ph and ka of from data. i. calculate the ph of 0.02m hcl ii. calculate the ph of 0.036m naoh iii. calculate the ph of 0.36m ca(oh)2 iv. calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 v. calculate ka for weak acid ha which has a ph of 3.65 at 0.30m concentration vi. calculate the ka of a solution made by mixing 15.0 cm3 0.2m ha and 60.0 cm3 0.31m a-. [ph= 3.80] vii. calculate the ph of a solution made by mixing 15.0 cm3 0.1m naoh and 35.0 cm3 0.2m hcooh. [ka = 1.82 x 10-4 m]