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A sample volume of 0.5mL was pipetted into a beaker, treated withreagents to produce an indigo color, transferred to a volumetricflask and diluted to 25 mL.The concentration of Fe was found to be2.
The system is released from rest. If there is no sipping between any of the surfaces, what is the acceleration of the board. Solve using force and torque.
A child and sled with a combined mass of 48.6 kg slide down a frictionless hill that is 8.94 m high. If the sled starts from rest, what is its speed at the bottom of the hill?
If a sample of gold with a mass of 2.857 g, is pressed into a leaf of 2.790 µm thickness, what is the area (in m^2) of the leaf?
Approximately 80% of the mass of a human body consists of aqueoussolutions (spinal fluid, blood, etc.) These solutions areunsaturated salt solutions that are 0.21 M NaCl and have a densityof 1 g/mL
A sample of N2 gas occupies 2.40 L at 20?C. If the gas is in acontainer that can contract or expand at constant pressure, at what temperature will the N2 occupy4.80 L?
The Moon is about 3.8 x 10^5 km from Earth. Show that its average orbital speed about Earth is 1026 m/s
One mole of oxygen gas is at a pressure of 6.70 atm and a temperature of 24.0°C. (a) If the gas is heated at constant volume until the pressure triples, what is the final temperature?
A 0.8159 g of KHP was placed in a 50mL volumetric flask and the sample was thoroughly dissolved in water to make 50mL of solution.
An equilateral triangle has sides of 0.14 m. Charges of -8.5, +8.0, and +1.6 µC are located at the corners of the triangle. Find the magnitude of the net electrostatic force exerted on the 1.6
For the uncatalyzed decomposition of H2O2(aq) to form H2O(l) and O2(g), the activation energy (Ea) and the change in energy(?E ) are 75.3kJ/mol and -98.1kJ/mol respectively.
(a) What is the magnitude of the electric field within the cell membrane? (b) Find the magnitude of the electric force that would be exerted on a potassium ion (K+; charge = +e) placed inside the me
In the experiment 2.00 g of salicylic acid (molar mass =138.1 g/mol) reacts with an excess amount of acetic anhydride.Calculate the theoretical yield of acetylsalicylic acid ( molarmass = 180.0 g/m
Four point charges have the same magnitude of 2.4 x 10-12 C and are fixed to the corners of a square that is 8.2 cm on a side. Three of the charges are positive and one is negative. Determine the m
For the uncatalyzed decomposition of H2O2(aq) to form H2O(l) and O2(g), the activation energy (Ea) and the change in energy(?E ) are 75.3kJ/mol and -98.1kJ/mol respectively. (15Points)
The four tires of an automobile are inflated to a gauge pressure of 1.7*10^5 Pa. EACH tire has an area of 0.023 m^2 in contact with the ground. Determine the weight of the automobile in Newtons.
A total of 50 mL of ice water are used in processing the final reaction mixture (including the water used to rinse theprecipitate). How many grams of aspirin could be lost in this process?
A novice golfer on the green takes three strokes to sink the ball. The successive displacements are 4.00 m to the north, 2.00 m northeast, and 1.00 m at 30.0° west of south. Starting at the same
A severe thunderstorm dumped 2.5 in of rain in 30 min on a town of area 34 km2. What mass of water (in kg) fell on the town? One cubic meter of water has a mass of 10^3 kg.
What is the length of a helical section of a polypeptide chain of20 residues? What is its length when it is fully extended? (Youneed to get bond lengths and angles using trig functions to get the l
Galileo made the first European observations of sunspots in 1610, and daily observations were begun in Zurich in 1749. At the present time we are well into the 23rd observed cycle. What is the frequ
In the determination of the quilibrium constant for the hydrolysis of 5.00mL of SbCl3, 24mL of water was addedand 0.0015 mol SbOCl precipitated.
A CD has a mass of 17 g and a radius of 6.0 cm. When inserted into a player, the CD starts from rest and accelerates to an angular velocity of 19 rad/s in 0.78 s. Assuming the CD is a uniform solid
Dichloromethane and Carbon tetrachloride... What are the partial pressures of these substances in the vapor above a mixturecontaining 1.6 mol of CH2Cl2 and 1.20 mol of CCl4 at 23.5 degrees Celsius?
The melting point of water at the pressure of interest is 0 degreescelcius and the enthalpy of fusion is 6.01 kj/mol. theboiling point is `00 degrees C and the enthalpy of vaporization is40.65 kj/mo