Asked by carolin
The combustion of hydrogen with oxygen is used to produce extremely high temperatures needed for certain types of welding procedures. What is the quantity of heat generated, in kj, when a 180g mixture containing equal parts oxygen and hydrogen gasses by masses burned? (ΔHrxn = -284 kj/mol)
Answers
Answered by
DrBob222
This is a limiting reagent problem and combustion problem rolled into one. First determine the limiting reagent. I do them the long way.
2H2 + O2 --> 2H2O
mols H2 = 90/2 = 45 mols
mols O2 = 90/32 = about 3 but you need a better answer than that.
Convert mols H2 to mols H2O = about 45
Convert mols O2 to mols H2O = about 3*2 = about 6. The correct answer in limiting reagent problems is ALWAYS the smaller value; therefore, O2 is the limiting reagent and approx 3 mols will be used.
kJ released = 284 kJ/1 mol x approx 3 mol = approx ?
2H2 + O2 --> 2H2O
mols H2 = 90/2 = 45 mols
mols O2 = 90/32 = about 3 but you need a better answer than that.
Convert mols H2 to mols H2O = about 45
Convert mols O2 to mols H2O = about 3*2 = about 6. The correct answer in limiting reagent problems is ALWAYS the smaller value; therefore, O2 is the limiting reagent and approx 3 mols will be used.
kJ released = 284 kJ/1 mol x approx 3 mol = approx ?
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