The population density of worms in a particular field is 35 worms per cubic meter of soil. How many worms would there be in the top meter of soil in a field that has dimensions of
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- (a) Carbon monoxide (CO) is a poisonous gas becauseit binds very strongly to the oxygen carrier hemoglobinin blood. A concentration of 8.00 × 102 ppm by volumeof carbon monoxide is considered lethal to humans.Calculate the volume in liters occupied by carbonmonoxide in a room that measures 17.6 m long,8.80 m wide, and 2.64 m high at this concentration.Pheromones are compounds secreted by females of manyinsect species to attract mates. Typically, 1.0 × 10−8gof a pheromone is sufficient to reach all targeted maleswithin a radius of 0.50 mi. Calculate the density of thepheromone (in grams per liter) in a cylindrical air spacehaving a radius of 0.50 mi and a height of 40 ft (volumeof a cylinder of radius r and height h is πr2h).A flask weighs 64.25 g when empty and weighs 91.75 g when filled with water at 20oC. However, when the flask is filled withthe same volume ofisopropyl alcohol at the same temperature, the combinedmass of flask and alcohol is 86.00 g. (a) If the density of water is 0.99823 g/mL at 20oC, what is the volume of water that filled the flask? (b) Determine the density of isopropyl alcohol at 20oC.
- In the United States, water used for irrigation is measuredin acre-feet. An acre-foot of water covers an acre to a depthof exactly 1 ft. An acre is 4840 yd2. An acre-foot is enoughwater to supply two typical households for 1.00 yr. (a) If desalinatedwater costs $1950 per acre-foot, how much doesdesalinated water cost per liter? (b) How much would it costone household per day if it were the only source of water?(a) After the label fell off a bottle containing a clear liquid believedto be benzene, a chemist measured the density of theliquid to verify its identity. A 25.0-mL portion of the liquidhad a mass of 21.95 g. A chemistry handbook lists the densityof benzene at 15 °C as 0.8787 g/mL. Is the calculated densityin agreement with the tabulated value? (b) An experimentrequires 15.0 g of cyclohexane, whose density at 25 °C is0.7781 g/mL. What volume of cyclohexane should be used?(c) A spherical ball of lead has a diameter of 5.0 cm. What isthe mass of the sphere if lead has a density of 11.34 g/cm3?(The volume of a sphere is 14>32πr3, where r is the radius.)Copper can be drawn into thin wires. How many meters of 34-gauge wire (diameter 5 6.304 x10-3 in) can be produced from the copper in 5.01 lb of covellite, an ore of copper that is 66% copper by mass? (Hint: Treat the wire as a cylinder: V of cylinder = π r2h; d of copper 5 8.95 g/cm3.)
- (a) A sample of tetrachloroethylene, a liquid used in dry cleaningthat is being phased out because of its potential to cause cancer,has a mass of 40.55 g and a volume of 25.0 mL at 25 °C. Whatis its density at this temperature? Will tetrachloroethylene floaton water? (Materials that are less dense than water will float.)(b) Carbon dioxide (CO2) is a gas at room temperature andpressure. However, carbon dioxide can be put under pressure tobecome a “supercritical fluid” that is a much safer dry-cleaningagent than tetrachloroethylene. At a certain pressure, the densityof supercritical CO2 is 0.469 g/cm3. What is the mass of a25.0-mL sample of supercritical CO2 at this pressure?What isthe density (g/mL) of an object that has a mass of 14.01 grams and, when placed into a graduated cylinder, causesthe water level to rise from 25.2 mL to 33.6 mL?55. A typical rate of deposit of dust ("dustfall") from unpolluted air is 10. tons per square mile per month. What is this dustfall, expressed in mg per square meter per hour? Assume 1 ton = 2000. lbs. and 1 month = 30 days.
- Water has a density of 0.96 mL-1 at its boiling point of 100 C under standard atmospheric pressure. The density of water vapor is about 1600 times less than the density of water under the same conditions. If a 1.00 L beaker of water was converted into water vapor at 100 C under standard atmospheric pressure, what would the volume (in L) of the water vapor be?An empty vial weighs 55.32 g. (a) If the vial weighs 185.56 gwhen filled with liquid mercury (d=13.53 g/cm³), what is itsvolume? (b) How much would the vial weigh if it were filledwith water (d=0.997 g/cm³ at 25C)?How Many Capillaries? The aorta has an inside diameter of approximately 2.1 cm, compared to that of a capillary, which is about 1.0 x 10 speed of flow is approximately 1.0 m/s in the aorta and 0.3 mm/s in a capillary. m (10 um). In addition, the average Part A Assuming that all the blood that flows through the aorta also flows through the capillaries, how many capillaries does the circulatory system have? Express your answer using two significant figures. Π ΑΣφ ? n =