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The contents of one 80. lb bag of topsoil will cover 30. square feet of ground to a depth of 1.7 in. What number of bags are needed to cover a plot that measures 600. by 700. m to a depth of 1.5 cm?
If the water in your house has 1000.0 mg/L of calcium carbonate dissolved in it, How many grams of sodium oxalate could you mix with 100.0 mL of that water before a precipitate would form.
The vapor pressure of a solution containing 53.6 g glycerin (C3H8O3) in 133.7 g ethanol (C2H5OH) is 113 torr at 40 degrees Celsius.
A saturated solution of Na2SO4 with excess of the solid is present in equilibrium with its vapor in a closed vessel. Calculate the number of degrees of freedom, f, of the system.
Two particles with charges q1 and q2 are separated by distance d. Rank these scenarios according to the magnitude of the electrostatic (coulombic) potential energy.
Green light of a wavelength 516 nm is absorbed by an atomic gas. What is the energy difference between the two quantum states involved in the transition.
A 6.50 x 10^-5 M solution of potassium permanganate has a percent transmittance of 27.3% when measured in a 1.15-cm cell at a wavelength of 525 nm.
Calculate the work done on a 2500. kg car in accelerating it from rest to a speed of 100. km/hr.
A particular compound contains, by mass, 41.4g carbon, 3.47g hydrogen, and 55.1g oxygen a 0.100 mol sample of this compound weights 11.60 g.
Calculate the concentrations of all species in a 1.66 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1=1.4x10^-2 and Ka2=6.3x10^-8.
Arrange the four compounds below in order of increasing volatility.
Explain what is methylphenidates purpose and its chemical structure? Also determine how does it affect the body of human beings ,what makes up that compound , what organs do it impact?
A student is given four solid samples labeled W, X, Y, and Z. All have a metallic luster. She is told that the solids could be gold, lead sulfide, mica (which is quartz or SiO2), and iodine.
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