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8.533 x 1022 molecules of Strontium hydroxide (Sr(OH)2), how many milligrams would you need to weigh out?
A charge of -3.80 nC and a charge of -6.80 nC are separated by a distance of 40.0 cm. Find the position at which a third charge of +7.60 nC can be placed so that the net electrostatic force on it i
You place 100 g of ethanol and 100 g of water in a refrigerator. Initially, both are at room temperature. Which of the two liquid samples will cool faster? explain why this happens.
What is the work of lift with weight = 1.29×10^3 kg accelerating uniformly from rest to 10.8 m/s in 2.10 s.
a mixture of 0.200g of H2, 1.00g of N2, and 0.820 g of Ar is stored in a closed container at standard temperature and pressure. What is the volume of the container assuming that the gases exhibit id
A student examines a ladybug using a magnifying glass with focal length of 5.0 cm. He holds the magnifying glass 3.5 cm above the ladybug. What is the magnification?
A 25.0 mL sample of a 0.080 M solution of aqueous trimethylamine is titrated with a 0.10 M solution of HCl. Calculate the pH of the solution after 10.0, 20.0, and 30.0 mL of acid have been added; pK
The calcium ion from the resulting solution, an excess of potassium oxalate was added. The precipitate of calcium oxalate, CaC2O4, weighed 1.437 g. What was the molarity of CaCl2 in the solution?
The barrel has a length of 0.60 m and an opening whose radius is 2.8 10-3 m. A bullet (mass = 2.7 10-3 kg) has a speed of 380 m/s after passing through this barrel. Ignore friction and determine the
For instance, we have an isolated spherical capacitor on an insulating rod with a conducting base. Why do you get the most accurate vale for capacitance when applying a guard voltage to the base and
How many milliliters of a 2.34M solution of glucose, C6H12O6, molar mass = 180.155 g/mol, do you need to obtain 25.0 g of glucose?
A gas mixture with a total pressure of 760mmHg contains each of the following gases at the indicated partial pressures: CO2. What is the partial pressure of the helium gas?
A car was seen driving off the edge of a cliff at an angle of 10.° above the horizontal. The cliff is 95. m high and the car impacted the ground at a distance of 156. m from the base of the cli
What is the sum of the stoichiometric coe?cients in the balanced equation? Do not forget to add the coe?cients that are 1.
Clifford is in a real hurry, however, and skips the speedramp. Starting from rest with an acceleration of 0.39 m/s2, he covers the same distance as the ramp does, but in one-fourth the time. What is
A small piece of dust of mass m = 1.4 g travels horizontally through an electric air cleaner in which the electric field is 495 N/C. The electric force on the particle is equal to the weight of the
A 2.77 L flask is filled with carbon monoxide at 27 °C until the pressure is 7.79 atm. Calculate the total pressure after 1.73 moles of carbon dioxide has been added to the flask. (R=0.082 L-atm
A model rocket is lauched straight upward with an initial speed of 80.0 m/s. it accelerates with a constant acceleration of 2.00 m/s^2 until its engines stop at an attitude of 200 m. the rocket cont
What is the potencial energy of an elevator with a mass of 8.00x 10^2 kg at the top of manila hotel, 3.80 m. above the street level?
When 5.00 g of X is titrated with NaOH, it is found that X has two acidic hydrogens that react with NaOH and that 54.9 mL of 1.00 MNaOH is required to completely neutralize the sample. What is the m
A 34.0 g sample of nitrogen gas reacts with an excess of hydrogen gas to give an actual yield of 4.75 g NH3. What is the percent yield for this reaction? Reaction: N2(g) + 3 H2(g) ? 2 NH3(g).
An object is found to move with an acceleration of magnitude 8 m/s2 when it is subjected to a force of magnitude 222 N. Find the mass of the object.
How much SO3 can be produced from 96.0 g of O2 and excess sulfur if the yield is 84.5%?
An athlete at the gym holds a 1.2 kg steel ball in his hand. His arm is 64 cm long and has a mass of 4.0 kg. What is the magnitude of the torque about his shoulder if he holds his arm straight, but
Using Heisenberg's uncertainty principle, calculate the uncertainty in the position of: a 1.50-mg mosquito moving at a speed of 1.40 m/s if the speed is known to within a + or - 0.01 m/s.