What mass of charcoal needs to be burned to release as much energy as when burning gasoline
January 30, 2021 | education
| What mass of charcoal needs to be burned to release as much energy as when burning gasoline, the volume of which is 4 liters.
Initial data: V2 (volume of gasoline burned) = 4 liters.
Constants: q1 (specific heat of combustion of charcoal) = 34 * 10 ^ 6 J / kg; q2 (specific heat of combustion of gasoline) = 46 * 10 ^ 6 J / kg; ρ2 (gasoline density) = 710 kg / m3.
SI system: V2 = 4 l = 4 * 10 ^ -3 m3.
We determine the mass of charcoal from the following equality:
q1 * m1 = q2 * ρ2 * V2, whence m1 = q2 * ρ2 * V2 / q1.
Let’s calculate: m1 = 46 * 10 ^ 6 * 710 * 4 * 10 ^ -3 / (34 * 10 ^ 6) = 3.84 kg.
Answer: 3.84 kg of charcoal will need to be burned.
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