Posted by **Mikky** on Sunday, October 10, 2010 at 6:30pm.

a bunsen burner flame takes 8 minutes to raise 250g of water from 20 degrees to 100 degrees celcius, when the water is in a beaker of mass 100g (c=0.67J/g degrees celcuius). How long will i take to raise the temperature of 200g of glycerin (c=2.43J/g degrees celcius) contained in the same beaker from 20 to 80 degrees celcius?

- enthalpy change -
**drwls**, Sunday, October 10, 2010 at 7:04pm
The heat required to raise the beaker temperature will be 3/4 as much the second time, becasue of the delta-T rTIO. The heat required to heat the liquid will be higher by a factor (200/250)(2.43/0.67) = 2.90

Calculate the total heat required in the second case. The ratio (heat)2/(heat1) wilL be the ratio of the heating times required, assuming the heaT transfer rate of the burner is the same.

- enthalpy change -
**Mikky**, Sunday, October 10, 2010 at 9:27pm
i dont get this, could you explain in details or could u tell me the ans. so i could verify my answer. thanks

## Answer this Question

## Related Questions

- physics - What mass of steam initially at 125 degree celcius is needed to warm ...
- Grade 12 Chemistry - If 100g of zinc (c=377J/kg degrees celcius) at 95 degrees ...
- Chemistry - A 335g block of copper cools from 95.0 degrees celcius to 27.2 ...
- physical scince - answer the following question: QUESTION 4: What does it mean ...
- Chemistry - Assuming complete dissociation of the solute, how many grams of KNO3...
- Chemistry - The solubility of KNO3 is 80g/100g water at 50 degrees and 10g/100g ...
- Chemistry - calculate the enthalpy change in delta H foor heating 250 grams of ...
- Chemistry AP help - 7. A 100g mass of tungsten at 100 degrees C is placed in 200...
- chemistry - How long would it take for 1.50mol of water at 100.0 degrees to be ...
- Science - Which of the following procedures increases the average kinetic energy...

More Related Questions