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3 years ago

The heat of a reaction may be found with the equation q=mcΔT.

Chemistry

1 answer:

sweet-ann [11.9K]3 years ago

4 0

Answer:

B) -1551 kJ

Explanation:

There are two heat flows in this question.

Heat released by engine + heat absorbed by water = 0

q₁ + q₂ = 0

q₁ + mCΔT = 0

Data:

m = 2.51 kg

C = 3.41 J°C⁻¹g⁻¹

T_i = 23.8 °C

T_f =205 °C

Calculations:

(a) ΔT

ΔT = 205 °C - 23.8 °C = 181.2 °C

(b) q₂

q₂ = mCΔT = 2510 g × 3.41 J·°C⁻¹g⁻¹ × 181.2 °C = 1.551× 10⁶ J = 1551 kJ

(c) q₁

q₁ + 1551 kJ = 0

q₁ = -1551 kJ

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