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想請教一些化學問題之詳解

1.What is the density(in g/L)of a 1:3(mole ratio)mixture of CH4 and O2 at(A)0.71 (b)0.90 (C)1.02 (D)1.25 (E)2.50Ans:(D) 2.What is the wavelength of a radio station that broadcasts at a frequency of 100.3 MHz? (A)3.37eV (B)6.75eV (C)27.0eV (D)54.eVAns:(C)3.(a)When an electron is accelerated through 80V

what is the characteristic wavelength of this electron? (b)How much voltage is needed in order to accelerate an α-particle to the same wavelength?4.What is the probability of finding a particle in a one-dimenional box in energy level n=4 between x=L/4 and x=L/2?(L is the length of the box.) (A)12.5% (B)25% (C)33% (D)37.5% (E)50%5.一粒子在長度為L的箱子形成駐波(standing wave)

其最長的波長為下列何者? (A)2L (B)L (C)L/2 (D)L/4Ans:(A)
1.混合氣體平均分子量 M = (1/4)×16 (3/4)×32 = 28 g/mol　PM = DRT ==