Use the Ideal gas equation to determine the formula weight! Mass = 1.00 g Volume = 0.820 L Pressure = 1.00 atm Temperature = 3 ºC + 273 = 276 ºK Ideal gas constant = R = 22.4/273 P * V = (Mass/Formula wt) * R * Temperature 1.00 * 0.820 = (1.00/ Formula wt) * (22.4/273) * 276 Multiply both sides by Formula wt, and divide both sides by 0.820 Formula Wt = (22.4/273) * 276 ÷ 0.820 Formula Wt = 27.6 1 mole of Hydrogen = 1.0 g 1 mole of Boron = 10.8 g Generic formula = HxBy.
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