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The first person is initially moving forward with a speed of 2.50 m/s, and the second person is initially at rest. What are the velocities of the two people after the snowball is exchanged? Disregar
A hard water sample contains 121 mg of CaCO3 per liter of water. Assuming the reaction goes to completion, calculate the mass of Na3PO4 needed to remove all Ca^2+ ions from 2.50 L of the water sampl
What is the total sample size (in grams) for a sample of disulfur octoxide which contains 3.52 g of oxygen?
How many grams of methanol must be added to 7.50kg of water to lower its freezing point to -15.0^circ C? For each mole of solute.
A loudspeaker of mass 16.0 is suspended a distance of = 2.20 below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of = 4.00 .
Prepare solution by dissolving .702g of Fe(NH4)2(SO4)2·6H2O in 50mL of water containing 1 mL of concentrated H2SO4. transfer solution completely to a 1L volumetric flask and dilute to exactly
How much energy in kilojoules is required to convert 260 mL of water at its boiling point from liquid to vapor?
A 1.630 -,g sample of naphthalene, C10H8(s)is completely burned in a bomb calorimeter assembly and a temperature increase of 8.46 degrees Celsiusis noted. If the heat of combustion of naphthalene i
A tennis player standing 11.4 m from the net hits the ball at 2.96° above the horizontal. To clear the net, the ball must rise at least 0.294 m. If the ball just clears the net at the apex of it
How will you prepare the following solutions from 6.0 M solutions of acetic acid and ammonia. Give exact details.
some potassium dichromate, K2CrO7, 2.335 g is dissolved in enough water to make 500. mL of solution. what are the moloar concentraitions of K+ and Cr2O7^2.
A rifle with a barrel length of 61 cm fires a 8 g bullet with a horizontal speed of 440 m/s . The bullet strikes a block of wood and penetrates to a depth of 15 cm. What resistive force (assumed to
The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 5.70mL of a 0.330M HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.760.
Which photon has a shortest wavelength when emitted from an atom that transitions from an excited energy to a lower energy?
A parachutist descending at a speed of 13.4 m/s loses a shoe at an altitude of 54.2 m. What is the velocity of the shoe just before it hits the ground? The acceleration of gravity is 9.81 m/s2. Answ
One mole of A and two moles of B are placed in a container. At equilibrium, the density of the gas mixture is 0.312 g/L at 0.2 atm and 500 K. What is the value of Kc in units of (mol/L)?
Calculate Ecell for the following electrochemical cell at 25 °C Pt(s) | H2(g, 1.00 atm) | H+(aq, 1.00 M) || Pb2+(aq, 0.150 M) | Pb(s) given the following standard reduction potentials.
A solid acid is dissolved in enough water to make 200 ml of a solution. 40 ml of the solution is titrated to a phenolphthalein end point with an NaOH solution. The neutralized solution and the remai
What is the molarity of a sodium hydroxide solution if 27.9 mL of this solution reacts exactly with 22.30 mL of 0.253 M sulfuric acid?
The expresssion for the freezing point depression of a solution relative to that of the pure solute is shown above. From solutions of known concentrations of p-dichlorobenzene in cyclohexane
A dead alkaline battery is found to contain a compound of Mn and O. Its analysis gives 69.9% Mn and 30.4% O. What is the empirical formula for the substance?
Protein provide about 4 Calories of energy per gram and fats provide about 9 Calories per gram, what is the total energy equivalent (in Calories) of a bag of chips? What percent of Calories are from
Identify chemical reactions upon which the cosmetic industry relies.