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vladimir1956 [14]
2 years ago
11

Some solutes have large heats of solution, and care should be taken in preparing solutions of these substances. The heat evolved

when sodium hydroxide dissolves is 44.5 kJ/mol. What is the final temperature of the water, originally at 20.0 o C, used to prepare 500.0 cm 3 of 6.00 M NaOH solution
Chemistry
1 answer:
OLga [1]2 years ago
3 0

Answer:

Final temperature of water is 83.8°C

Explanation:

In 500.0mL of a 6.00M NaOH solution, there are:

0.5000L × (6.00mol NaOH/ L) = <em>3.00moles of NaOH</em>

As the heat involved in dissolution is 44.5 kJ/mol, when the solution is dissolved:

44.5kJ/mol × 3.00moles = 133.5kJ = 133500J

Using coffee-cup calorimeter equation:

q = m×C×ΔT

<em>Where q is heat, m is mass of water (500.0g), C is specific heat of water (4.186J/g°C) and ΔT is change in temperature</em>

<em />

133500J = 500.0g×4.186J/g°C×(X-20.0°C)

63.8 = (X-20.0°C)

83.8°C = X

<em>Final temperature of water is 83.8°C</em>

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