Given the reaction: 2C2H2(g) + 502(g) → 4CO2(g) + 2H2O(g)
What is the total number of grams of O2(g) needed to react
completely with 0.50 mole of C2H2(g)?

A)40 g
B)160 g
C)10 g
D)80 g

Water is initially present in a state where its molecules are far apart. during a change of state, its molecules slow down. which change of state has most likely taken place? from a gas to a liquid from a liquid to a gas from a solid to a liquid from a gas to a plasma

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

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.