Please answer as fast as possible thank you (4) A coffee cup calorimeter having

Question

Please answer as fast as possible thank you
(4) A coffee cup calorimeter having a heat capacity of 472 JAC is used to measure the heat evolved when the following aqueous sol both initially are mixed: of a solution con 6.62 and 100 containing 600 sodium g temperature is The final 242 c that beat of the same for water equation for the reaction is: 2NaNO) (aq) 2Nal (aq) Pbliz (s) (a calculate the evol in the reaction (remember that you have to take consider the heat heat how you arrived at your answer. absorbed by the calorimeter i Show

Explanation / Answer

a)

Themassofthesolutionsafterbeingmixedisatotalof200grams.

qcal = Hrxn = CcalT + mCsolutionT

            Hrxn = (472 J/C)(24.2C 22.6C) + (200g)(4.184 J/gC)(24.2C 22.6C)

             Hrxn = 2094 J

               Hrxn = 2094 J = -2.09 kJ

b)

We have 6.62 g lead (ii) nitrate.

Molar mass of lead (ii) nitrate is 331.21

Moles of Pb(NO3)2 = 6.62/331.21 = 0.0199 = 0.2 moles

               Hrxn per mole = -2.09 kJ/0.02 moles = -104.5 kJ/mol

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