1. A sample of liquid water is heated with an electrical coil. If 1030 Joules of
ID: 905875 • Letter: 1
Question
1. A sample of liquid water is heated with an electrical coil. If 1030 Joules of energy are added to a 13.5 gram sample and the final temperature is 38.6°C, what is the initial temperature of the water?
Answer:______ °C.
2.When Fe(s) reacts with Cl2(g) according to the following reaction, 400 kJ of energy are evolved for each mole of Fe(s) that reacts. Complete the following thermochemical equation.
3. When BrF3(g) reacts to form Br2(g) and F2(g), 271 kJ of energy are absorbed for each mole of BrF3(g) that reacts. Complete the following thermochemical equation.
Explanation / Answer
where:
Q= calorie in Joule (1030)
m= mass in gram(13.5)
c= specific heat capacity in J/g celcius (for water, c is 4.184 J/g celsius)
T= temperature in celcius( 38.6)
1030 J = 13.5g x 4.184 J/g cesius x (38.6-X)
Initial temp. X = 20.4 degree celsius
2. Energy evolved in given reaction = 2 mole( Fe) x 400 KJ = 800 KJ
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