5 grams of a substance are burned and the heat given off raises the temperature of 50 grams of water from 30?

Question

(continuing question) to 50 degree celciuus find the heat of combustion of the substance

Answer 1

Step 1: Define your formulae:
Heat of Combustion = Energy released / mass of substance (Hc = E/m).
Also:
E = specific heat of water * change in temperature * mass of water (E = Hs * T * m)

Step 2: Using the information given about mass and temperature change of the water to determine the energy released:
E = 4184 J / (kg * C) * 20 degrees * .05 kg = 4184 J

Step 3: Plug the energy released in to the first equation to determine Hc.
E = Hc * m
Hc = E / m
Hc = 4184 J / 5 g
Hc = 836.8 J/g (solution!)

Answer 2

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