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An example of a gas with a composition of 18.9% hydrogen and the rest is boron with a mass of 0.434 grams occupies a volume

An example of a gas with a composition of 18.9% hydrogen and the rest is boron with a mass of 0.434 grams occupies a volume of 356 cm3 at a pressure of 730 mmhg and a temperature of 98 Celsius. What is the empirical formula. What is the mulecular formula.

the answer is B2H5 and B4H10

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