An average sample of coal contains 3.0% sulfur by mass. calculate the moles of sulfur present in 2.40 ´ 103 kg of coal.

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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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