Combustion Energy Transfer Question? How many grams of methane [CH4(g)] must be combusted to heat 1.20 kg of water from 25.0°C to 95.0°C, assuming H2O(l) as a product and 100% efficiency in heat transfer?

I could really use some help on this one, i%26#039;m stumped!

Best Answer - Chosen by Voters

Assuming a constant pressure system:
You need to find the specific heat (cp) of water. Then use the equation
delta Q = m*c* delta T
m= mass
cp= specific heat of substance at constant pressure
delta T= Temperature final- temperature initial
delta Q is what you are solving for and it is the energy needed to raise the temperature. Once you know Q, use the same equation and solve for m using the specific heat of methane instead.
Make sure you are careful to use the right units in your equation and be consistent.
If it is a constant volume, rather than constant pressure system your specific heat will be different but I would guess it is a constant pressure system based on the question you put online. 100% 2 Votes

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