please help solving Thermal pollution, the release of large amounts of heat into

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Thermal pollution, the release of large amounts of heat into rivers, is a serious problem near power plants and can affect the survival of some species of fish. For example, trout will die if the temperature of the water rises above 25 degree C. Express this temperature in degree F and in K. The density of an unknown liquid is 0.927 g/mL Express this density in kg/gal. (1 gal = 3.785 L) How many ounces of nicotine does a person inhale by smoking 56 cigarettes if one cigarette contains 0.90 mg of nicotine? (1 ounce = 28.3495 grams)

Explanation / Answer

All of these three questions use the factor-label method, aka the unit factor method of making conversions.

#3.    The formula for converting deg C to deg F is:    F = (9/5) C +32   plug in C = 25 to get   F = (9/5)(25) + 32 = 77 deg F

#4.    (0.927 g/mL) ( 1 kg / 1000 g ) (1000 mL / L ) ( 3.785 L / gal ) =   3.509 kg /gal

#5    ( 56 cigs ) (0.90 mg / cig ) (1 g / 1000 mg ) ( 1 oz / 28.3495 g )   =   1.429 oz

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