A sample of chloroform is found to contain 11.1 g of carbon, 98.4 g of chlorine,

Question

A sample of chloroform is found to contain 11.1 g of carbon, 98.4 g of chlorine, and 0.93 g of hydrogen. If a second sample ofchloroform is found to contain 25.0 gof carbon, what is the total mass of chloroform in the secondsample?
Don't even know where to start A sample of chloroform is found to contain 11.1 g of carbon, 98.4 g of chlorine, and 0.93 g of hydrogen. If a second sample ofchloroform is found to contain 25.0 gof carbon, what is the total mass of chloroform in the secondsample?
Don't even know where to start

Explanation / Answer

This is just a case of proportional masses. Any sample of chloroform will have the masses of carbon,chlorine and hydrogen in the same proportions. We are given themasses of carbon, chlorine and hydrogen in the first sample. Fromthat we can calculate the masses of chlorine and hydrogen in the2nd sample. Ratio of masses of carbon in 2nd and 1st samples: 25.0 g /11.1 g = 2.25    Multiplying the mass of each element in the1st sample by 2.25 will give us the masses of the elements in the2nd sample.          C            Cl               H       11.1         98.4            0.93       (*2.25)    (*2.25)      (*2.25)       25.0         223.63      2.114 Adding these masses gives us the total mass of chloroform inthe 2nd sample i.e. = 25.0 + 223.63 + 2.114                                                                                                                         = 250.74 g  

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