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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)
The aorta branches into tens of thousands of capillaries whose total cross-sectional area is about 2.75 m2. What is the average blood speed through them?
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?
A block falls from rest from the top of a 178-m-high building. When the block is 58.0 m above the ground, a man, 1.90 m tall, standing directly underneath, sees the block. How much time does he have
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.
The coefficient of kinetic friction between the 48.0 kg block and incline is 0.250. Determine the change in the kinetic energy of the 48.0 kg block as it moves from A to B, a distance of 20.0 m.
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
A 95 g ball on a 60 cm long string is swung in a vertical circle about a point 200 cm above the floor. The string suddenly breaks when it is parallel to the ground and the ball is moving upward. The
How many grams of a stock solution that is 87.5 percent H2SO4 by mass would be needed to make 275 grams of a 55.0 percent by mass solution? Show all of the work needed to solve this problem.
What does a negative electron affinity mean? What does a positive electron affinity mean?
A uniform electric field of magnitude 6.9 passes through a circle of radius 12 . What is the electric flux through the circle when its face is perpendicular to the field lines?
The reaction will be spontaneous until some NO forms in the mixture. What maximum partial pressure of NO builds up before the reaction ceases to be spontaneous?
The mixture is analyzed and is found to contain 1.27 mol co2 , and 3.40 mol co and 1.50 mol ar what is the partial pressure of ar?
The solution will turn blue-black at four different times. Each time, the concentration of iodine ion will have changed by 0.0020 mol/L. What is the cumulative change in concentration of iodide ion
How many grams of PH3 can form when 37.5 g of phosphorus and 83.0 L of hydrogen gas react at STP? (balance the equation)
An object of mass m is traveling on a horizontal surface. There is a coefficient of kinetic friction mu between the object and the surface.