PLEASE HELP is the enthalpy change when 1 mole of a substance undergoes complete combustion under standard conditions. A. ∆Hθa B. ∆Hθn C. ∆Hθf D. ∆Hθc

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warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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