Question
Asked Sep 17, 2019
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“Q-gas” is a mixture of  helium and  butane  by mass. It is used as a filling for gas-flow Geiger counters. Compute the mass percentage of hydrogen in Q-gas.

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Expert Answer

Step 1

The mass of each element as the percentage of total mass is given by mass percentage. It is expressed in the equation given below in which m is the mass of the element and M is the molar mass of the compound.

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.x 100 ...... (1) m%

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Step 2

Consider the 100 g sample of Q-gas in which 98.7 g is Helium and 1.3 g is butane. The molar mass of butane is 58.12 g/mol.

The mass, 58 g of butane contains (10 ×1.0079 g ) hydrogen. Thus, the amount of hydrogen in 1.3 g butane  is calculated as follows:

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10 x 1.0079 g x1.3 g 58.12 g = 0.225 g

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Step 3

The percentage of hydrogen is calculated by...

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m 0.225 gx100 100 g 0.225%

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