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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
What is the theoretical yield of aluminum oxide if 2.40 of aluminum metal is exposed to 2.10 of oxygen?
Write a balanced net equation for the reaction between aqueous solutions of HClO4 and NaH2PO4. Write a balanced net equation for the reaction between aqueous solutions of HBr and NH3.
Calculate the theoretical yield of rm C_2H_5Cl when 119 g of rm C_2H_6 reacts with 250 g of rm Cl_2, assuming that rm C_2H_6 and rm Cl_2 react only to form rm C_2H_5Cl and rm HCl.
Draw the lewis structure for C2H2 and C2H4 include all lone pair electrons
What is the average time-integrated Sm/Nd ratio of a magma source whose present 143Nd/144Nd ratio is 0.51300? Assume that t = 4.60 × 109y and that the initial 143Nd/144Nd ratio of the magma s
What is the pH of the solution resulting from the addition of 40.0 mL of 0.200 M HClO4 to 20.0 mL of 0.150 M NaOH?
Assuming that the collision factor remains the same, by how much must an enzyme lower the activation energy of the reaction in order to achieve a 3×105-fold increase in the reaction rate?
A tiny speck of radioactive Americium-241 (241.06 g/mol) is used in smoke detectors. what is the mass in mg of 2.5 x 10^18 atoms of Americium-241 present in these smoke detectors?
A gas bottle contains 0.650 mol of gas at 730 mm Hg pressure. If the final pressure is 1.15 atm, how many moles of gas were added to the bottle?
Which has more mass: a lamp of coal (assumed to be 100% carbon) or the carbon dioxide gas formed from burning the lump of coal?
Select two different groups from the periodic table & describe all the characteristics that make the elements in the group similar.
What mass of sodium chloride, NaCl, is needed to make 389. g of a 3.89%(m/m) NaCl solution? (atomic masses: Na = 22.99, Cl = 35.45)
If a sample of 6.022 g of CH4 is enclosed in a 30 L container at 402 K. What is its pressure in atmospheres?The volume is reduced to 12 L at constant temperature. What is the new pressure in atmosp
Glucose (C6H12O6) is oxidized by molecular oxygen to carbon dioxide and water. how many O2 molecules are needed for each molecule of glucose that is oxidized?
Fill the flask to the mark with distilled water. Calculate the mass of sodium hydroxide that the chemist must weigh out in the second step. Round your answer to significant digits.
Given the absorbance spectrum of compound A below. At what wavelength does compound A most strongly absorb visible light?
A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3. Determine the pH of the solution after the addition of 100.0 mL of HNO3. The Kb of NH3 is 1.8 × 10-5.
Calculate the amount of heat liberated (in kJ) from 421 g of mercury when it cools from 91.0°C to 11.0°C.
The second -order decomposition of NO2 has a rate constant of 0.255 M-1S-1. How long will it take for 75% of NO2 to decompose if the initial concentration of NO2 is 1.33M?
An absorbance of 0.395 at 460 nm is measured for a solution of compound A with an unknown concentration. If the same sized cuvette is used, what is the concentration of compound A in this solution?
What volume of sodium thiosulfate and water are needed to make an approximate 0.10 M solution starting with 1.0 M sodium thiosulfate solution?
You are given pure samples of ethane, C2H6(g), and toluene, C7H8(l). What prediction would you make concerning their standard molar entropies at 298 K?
Given that the cuvette used in the measurement has a pathlength of 1.00 cm, determine the extinction coefficient of compound A at 460 nm.
A fixed quantity of gas at 24^circ C exhibits a pressure of 758 torr and occupies a volume of 5.12 L. Calculate the volume the gas will occupy if the pressure is increased to 1.89 atm while the tem