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93.4 cm x 46. cm =
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93.4 cm x 46. cm = 4296.4cm^2
correct to two significant figure the answer is 4200 cm^2
correct to three significant figures the answer is 4290 cm^2
in five significant figure the answer is 4296.4 cm^2
in six the answer is 4296.40 cm^2
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1. Consider the dissolving of ammonium nitrate, NH4NO3 (s), for which ∆H° = +25.3 kJ/mol. If 133 grams of
ammonium nitrate are dissolved in 367 grams of water, and the initial temperature is 25.0°C, what will be
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styrofoam coffee cup: • 5.00 mL of 0.64 M citric acid
• 45.00 mL of 0.77 M NaOH
The two solutions start at a temperature of 25.5°C, and reach a final temperature of 27.8°C. The final,
combined mixture has a mass of 51.6 grams and a specific heat of 4.0 J/g°C. Assume that no heat is
transferred to the cup or surroundings.
a) Write a complete, balanced equation for the neutralization of citric acid (H3Cit) and NaOH.
b) Determine the total heat absorbed by the solution during this reaction.
c) Calculate the number of moles of citric acid that reacted.
d) Calculate the enthalpy of reaction, ∆H, for this reaction in kJ/mol. Is the reaction exothermic or
endothermic? 3. a) Using only the following information:
• ∆H°f for NO (g) is +90.4 kJ/mol
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