odnois ew.php?id 4842684 Mail yxg484@med....BankMobile: Open A... chase ing Jump

Question

odnois ew.php?id 4842684 Mail yxg484@med....BankMobile: Open A... chase ing Jump to... Sapling Learning In a constant-pressure calorimeter, 55.0 ml of 0.340 M Ba(OH)2 was added to 55.0 ml of 0.680 M HC The reaction caused the temperature of the solution to rise from 23.84 to 28.47 . If the solution has the same density and specific heat as water (1.00 g/mL and 4.184 Jg·, respectively), what is AH for this reaction (per mole of H2O p Assume that the total volume is the sum of the individual volumes. 2

Explanation / Answer

The reaction is as follows:

Ba(OH)2  + 2 HCl ---> BaCl2  + 2 H2O

Now, the above reaction is exothermic since the temperature of the solution increased.

To determine energy (in the form of heat) for a calorimeter (constant pressure) we can use the equation:

q= m x Csp x T

mass Ba(OH)2: 55.0 mL x  1 g    = 55 g

   mass HCl: 55.0 mL x 1 g = 55

mass solution = 55 g Ba(OH)2 + 55 g HCl = 110 g

q = 110 g x 4.184 J/gC x (28.47° C - 23.84 °C) =2130.91 J

Now, moles H2O = moles HCl reacted

therefore,  55 mL x   1 L    x 0.680 mol x 1 mol H2O  = 0.037 moles

So, H/mol H2O = 2130.91 J /0.037 moles H2O = 57592.1 J/mol = 57.6 kJ/mol

Related Questions

Navigate

• Browse (All)
• Browse O
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.