How many degrees(Celsius) would the temperature rise if 4,0g of NaOH was initially dissolved in 50mL of water.
Calculate the molar enthalpy change of solution based on this information:
- 4g NaOH(s) gets dissolved in 250mL of water, and the temperature rose from 19,5 to 23.0 Celsius.
- 4.18 J to raise temperature in 1 gram of water 1 Celsius.
- Water density: 1,0g/mL.
- No energy was exchanged with the surroundings before the temperature change was measured.
I solved this and ended up with 36,575 kJ/mol
The Attempt at a Solution
Here is what I`ve tried:
50ml of water = 50 grams
Molar mass of water: 18,016 g/mol
50/18,016= 2,7753 mol
2,7753 mol * 36,575 kJ/mol= 101kJ
101kJ * 1000= 101000 J
101000/4,18 J/g * Celsius=24162
24162/1000=24,16 Celsius ???
19,5+24,16= 43 Celsius??
I dont understand?
The correct answer is from 19,5 to 37.0 Celsius.