Quanto ‘pesa’ (ou melhor, qual é a massa), em gramas, uma única molécula de açúcar comum (sacarose -C 12 H 22 O 11 )? Dados: Massas atômicas: H = 1; C = 12; O = 16, Número de Avogadro: 6.10 23

Select the correct answer. which phrase correctly describes temperature? o a. average rotational kinetic energy of the particles in an object o b. average energy of the particles in an object c. average translational kinetic energy of the particles in an object od. all energy possessed by the particles in an object

Which of these expressions are correct variations of the combined gas law? p1v1t2 = p2v2t1 both

)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.