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sp2606 [1]
4 years ago
14

Two aqueous solutions are both at room temperature and are then mixed in a coffee cup calorimeter. The reaction causes the tempe

rature of the resulting solution to fall below room temperature. Which of the following statements is TRUE? None of these statements are true. a.The products have a lower potential energy than the reactants. b.Energy is leaving the system during reaction. The reaction is exothermic. c.This type of experiment will provide data to calculate ΔErxn.d. The mixing is endothermic.
e. None of the above statements are true.
Chemistry
1 answer:
sergiy2304 [10]4 years ago
3 0

Answer:

E. None of the above statements are true.

Explanation:

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Volume of NaOH required to react = 145.5 ml

<h3>Further explanation</h3>

Reaction

CO₂(g) + 2 NaOH(aq)  ⇒Na₂CO₃(aq) + H₂O(l)

The volume of CO₂ : 0.45 L

mol CO₂ at STP (O C, 1 atm) ⇒ at STP 1 mol gas 22.4 L :

\tt mol~CO_2=\dfrac{0.45}{22.4}=0.02

From the equation, the mol ratio of CO₂ : NaOH = 1 : 2, so mol NaOH :

\tt mol~NaOH=\dfrac{2}{1}\times 0.02=0.04

Then volume of NaOH :

\tt V=\dfrac{n}{M}\\\\V=\dfrac{0.04}{0.275}\\\\V=0.1455~L\rightarrow 145.5~mL

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