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How many moles of helium are in a balloon at 755 mmhg if it has a volume of 18 l at 25c? SOMEBODY PLEASE HELP! Two dice are tossed. What is the probability of getting a sum of at least 3? (Enter your probability as a fraction.)? Calculate the de Broglie wavelength of a 143-g baseball traveling at 89 mph.? How to know if a compound is aromatic by just looking at the formula? CHEMISTRY? Consider the equation z^5=(1+i).Find the value of z and has the second smallest positive argument θ, 0<θ<2π.z=re^iθ where r = θ =?