How many grams of H2 gas are needed to bring 1kg H2O to a boil from 25 degree C? : Eco Answers

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Question by Zetrick: How many grams of H2 gas are needed to bring 1kg H2O to a boil from 25 degree C?
Here’s the whole question:
“Using the combustion reaction, and gaseous (g) reactants and products, calculate how many grams of hydrogen would be needed to bring 1.00 kg of water(H2O) to boiling (100.0 degree C) from 25 degree C? Assume 100% efficiency.”

I figured out how much energy it would take to bring water to a boil from 25 degree C:
q = (1000gH2O) (4.184J/gC) (75degreeC)
q = 313,800 J or 313.8 kJ

But I am completely lost in trying to figure out how many grams of H would be needed to complete the reaction…

Can anybody put me on the right track?
Thanks!

Best answer:

Answer by Alex
Try looking up how many BTU’s (British Thermal Units) are in a fixed quantity of Hydrogen Gas.

http://en.wikipedia.org/wiki/British_thermal_unit

A BTU being the unit of measurement that covers approximately the amount of energy needed to heat 0.454 kg of water by 0.556 °C

1 BTU = 1,055.05585 joules
1 Liter Hydrogen Gas=9.54 BTU

The rest is just plugging in the numbers.

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How many grams of H2 gas are needed to bring 1kg H2O to a boil from 25 degree C?

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