It requires 350 joules to raise a certain amount of a substance from 10.0°C to 30.0°C. The specific heat of the substance is 1.2 J/g°C.

Use the heat equation q = mcΔT, where ΔT = 30.0°C − 10.0°C = 20.0°C. Solving for mass gives m = 350 J ÷ (1.2 J/g°C × 20.0°C) ≈ 14.6 g, which rounds to 15 g. The correct choice is B, 15 g.

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