$\mathbf{\u2206}\mathbf{H}\mathbf{}\mathbf{=}\mathbf{}\frac{\mathbf{q}}{\mathbf{mol}}$

Butane combusts according to the equation: C_{4}H_{10}(g) + 13/2 O_{2}(g) → 4 CO_{2}(g) + 5 H_{2}O(g); ΔH˚_{rxn} = -2658 kJ. What mass of butane in grams is necessary to produce 2.1×10^{3} kJ kJ of heat?

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