part 1- A certain compound is known to contain carbonand hydrogen. It might also

Question

part 1- A certain compound is known to contain carbonand hydrogen. It might also contain oxygen. A 3.304 g sample ofthis compound was burned in pure oxygen gas. The measured amount ofCO2 produced was 7.847 g, while that of H2Owas 4.015 g. No other products were produced in the reaction.
How many grams of carbon were in the original sample that underwentcombustion ? part 2- How many grams of hydrogen were in the original sampleof the above question ? part 1- A certain compound is known to contain carbonand hydrogen. It might also contain oxygen. A 3.304 g sample ofthis compound was burned in pure oxygen gas. The measured amount ofCO2 produced was 7.847 g, while that of H2Owas 4.015 g. No other products were produced in the reaction.
How many grams of carbon were in the original sample that underwentcombustion ? part 2- How many grams of hydrogen were in the original sampleof the above question ?

Explanation / Answer

7.847 g of CO2 were produced. Every one moleof CO2 contains one mole of carbon atoms. Themolecular weight of CO2 is 44.008 g/mol, and the atomicweight of carbon is 12.01 g/mol. Use all of this informationto determine the mass of carbon: (7.847 g CO2)(1 mol CO2/44.008 gCO2)(1 mol C/1 mol CO2)(12.01 g C/1 mol C) =2.141 g C 4.015 g of H2O were produced. Every one moleof H2O contains two moles of hydrogen atoms. Themolecular weight of water is 18.02 g/mol, and the atomic weight ofhydrogen is 1.01 g/mol. Use all of this information todetermine the mass of hydrogen: (4.015 g H2O)(1 mol H2O/18.02 gH2O)(2 mol H/1 mol H2O)(1.01 g H/1 mol H) =0.450 g H (= 0.225 g H2)

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