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0.437g of dinitrogen oxide gas and 0.55g of fluorine gas is in 1.64L vessel at 40.077C What are the mole fractions of the individual gases? Tom are four times the age of his son. After 6 years, the sum of their ages is 52 years. Find the present age of his son? What is the difference between an artificial and natural harmonic on guitar? If ultraviolet rays ionize the air, can electricity flow through the ionized air? Find the value of K: tan a + tan(120+a) = Ktan3a?