[zinedine_88]

the problem is


What mass of METHANE is needed to heat up 285 grams of water from 42 degrees Celsius to 106 degrees celsius...



I tried whatever I could... but the computer doesn't get the answer..

thanks...

[sjb]

Let's see your working, and see if it's a problem there, or with the computer program....

[MrOHBrown]

You will need to first determine the total energy output (Heat of combustion) required for that much of a temperature change in water

Heat required = - (mass of water) x (specific heat of water) x (change in temperature)

Use the molar heat of combustion of methane to determine how many moles of methane is required and use your mole conversion equation to change that to a mass value.

There should be a tonne of websites explaining this.

[zinedine_88]

i got it

there was a miscalculation cuz i had to assume that the water that is a product of the combustion of METHANE is a STEAM.... , not a liquid...thanks everybody

no u can delete it...