Question

what is the impercal formal for a compound that contains 17.34 of hydrogen 82.66 of carbon

Answer 1

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Divide by relative atomic masses to get the mole ratio  

Mole ratio C : H = 82.66/12.01 : 17.34/1.008 = 6.88 : 17.20  

To get this as a 1:x ratio, divide both by the smaller of the two  

Mole ratio C : H = 6.88/6.88 : 17.20/6.88 = 1 : 2.5  

To get this as a whole number ratio, multiply both by 2  

Mole ratio C : H = 2 : 5  

Therefore, the empirical formula is C2H5

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