Chemical hand warmers contain a super saturated sodium acetate solution. When a

Question

Chemical hand warmers contain a super saturated sodium acetate solution. When a metal disc is flexed in the solution it trips it to change phases, giving off 270 J/g ot heat. If a sodium acetate solution contains 0.65 moles of sodium acetate, how many Joules of heat arc released? Tamiflu is an antiviral drug used to treat influenza. The active ingredient in this pharmaceutical, shikimic acid, is extracted from the seed pods of the star anise by boiling the pods. In a 294.3 mL sample of a 2.3 times 10^-3 M shikimic acid solution, how many moles of schikimic acid are present? To test for type 1 diabetes doctors will often request a urine analysis to be done. One pan of the urine analysis test is to determine the molarity of uric acid (H_2C_5HN_4O_3) in the urine. If 10.0 mL of acidic urine was titrated with 2.5 times 10^-2 mL of 0.1 M NaOH. what is the molarity of uric acid in the urine? H_2C_5HN_4O_3 (aq) + 2 NaOH (aq) rightarrow Na_2C_5HN_4O_3 (aq) + 2 H_2O (I) a. The diagnosis will be positive for type 1 diabetes if the sample contains an acid concentration greater than 3.16 times 10^-5 M. Is the sample titrated above positive or negative for type 1 diabetes?

Explanation / Answer

3)

Cp = 270 J / g

molar mass of sodium acetate = 82 g / mol

moles of sodium acetae = 0.65

mass of sodium acetate = 0.65 x 85 = 55.25 g

heat released = 55.25 x 270

                  = 14918 J

4)

volume = 294.3 mL = 0.2943 L

molarity = 2.3 x 10^-3 M

moles = molarity x volume

            = 2.3 x 10^-3 x 0.2943

            = 6.8 x 10^-4

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