Answer:
a) 15.2 kJ/g
b) 1367 kJ/mol
Explanation:
<u>Given:</u>
Mass of lactic acid = 0.5865 g
Heat capacity C of calorimeter = 4.812 kJ/C
Initial temperature, T1 = 23.10 C
Final temperature, T2 = 24.95 C
<u>To determine:</u>
Heat of combustion/gram and heat/mole lactic acid
<u>Calculation:</u>
Molar mass of lactic acid = 90.08 g/mol
The heat of combustion is given as:
where C = heat capacity of calorimeter
T1 and T2 are the initial and final temperatures
a) heat of combustion per gram
b) heat of combustion per mole
Fire probably i dont know
The answer is: "Twelve (12) moles of Fe (iron) would be required."
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or:
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The answer is: "12" .
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Note: The balanced chemical equation is given:
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4 Fe + 3 O₂ → 2 Fe₂O₃
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The product is: 2 moles of Fe₂O₃ ; that is, "2 moles of iron (III) oxide" .
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→ If SIX (6) moles of iron oxide were produced, that would be "3 (three) times the number of moles of iron oxide produced (3 TIMES 2) ;
→ since: "6 ÷ 2 = 3" ; and since the equation is balanced.
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→ So we want to find the number of moles of "iron (Fe)" needed in such a situation. In the balanced chemical, we have "4 Fe" (that is, "FOUR (4) moles of iron") ; so we multiply that number by "3", proportionally:
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→ 4 (moles Fe) * (3) = 12 (moles Fe) .
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