How long does it take a person at rest to breathe
How long does it take a person at rest to breathe one mole of air if the person breathes 78.0 mL/s of air that is measured at 25 degrees Celcius and 755 mmHg?
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If the critical resolved shear stress is 26.2 MPa, what applied stress (in MPa) will be necessary to cause the single crystal to yield?
A jewler wishes to make solid gold cylindrical charms with a heightof 2.0cm and a radius of 5.25mm. Gold has a density of 19300kg/m3 and is $1095 per oz. The volume of a cylinder isπr2h. How much will she have to pay for the goldfor each cylind
A certain copper ore contains 2.98% of Cu2S by mass, andthe remainder of the ore contains no copper. In 1991, a singleopen-air smelt furnace heated 32000 tons of this ore.
A Sunscreen preparation contains 2.50% by mass benzyl salicylate. If a tube contains 4.0 ounces of sunscreen, how many kilograms of benzyl salicylate are needed to manufacture 325 tubes of sunscreen?
186 grams of sodium oxide, a basic anhydride, are to be neutralized in a 2 step method. First the solid is added to excess water to produce an aqueous solution of sodium hydroxide.
Calculate the lattice energy of calcium chloride given that the heat of sublimation of CA is 121 kJ/mol and enthalpy of formationof CaCl2 = -795 kJ/mol.
A solution of 22.0g CaCl2 in 100.0 cm^3 of water has a vapor pressure of 22.8 torr at 26 celsius. Why does this result supprt the view that CaCl2 is completely ionized to Ca 2+ and Cl - in aqueous solution?
At standard temperature and pressure, what volume of oxygen would be required to be required to burn 2000 g of propane? If air is 21 percent oxygen, what volume of air at STP would be required?
Twenty dietary iron tablets with a total mass of 22.131 g were ground and mixed thoroughly. Then 2.998 g of the powder was dissolved in concentrated HNO3 and heated to convert all the iron to Fe3+.
What is the molarity of the acid? How many kilograms of sodium carbonate are needed to completelyneutralize the acid?
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