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What is the mole fraction of 1.98 m Fe(NO3)3(aq)? The molar mass of Fe(NO3)3 is 241.9 g/mol and the molar mass of water is 18.02 g/mol.
A white solid precipitate forms. What happens to the mass of the mixture after the solid precipitate forms? Choose the best answer.
Condensation occurs on a bathroom window at a rate of 0.5kg per hour. If the bathroom air is at 26 Deg C and fully saturated with water vapour, calculate approx the rate of heat transfer on to the w
A 34 kg child sits in a swing supported by two chains, each 3.1 m long. If the tension in each chain at the lowest point is 283 N, find the child's speed at the lowest point.
What is the mole fraction of MgCl2 in a solution that is 11.04% by mass MgCl2(aq)? The molar mass of MgCl2 is 95.21 g/mol.
The dry solid weighs 0.397 g. Use this mass and dillution volumes to calculate the actual molarity of the sulfuric acid in the initial solution
What velocity would a proton need to circle Earth 1000 km above the magnetic equator, where Earth's magnetic field is directed horizontally north and has a magnitude of 4.00 10-8 T?
The specific heat capacity of silver is 0.235 J/g K. Its melting point is 962 C and its enthalpy of fusion is 11.3 kJ/mol. What quantity of heat in joules is required to change 5.00 g of silver from
A 2.52- sample of a compound containing only carbon, hydrogen, nitrogen, oxygen, and sulfur was burned in excess to yield 4.36 of and 0.892. Calculate the empirical formula of the compound.
A rocket of total mass 2630 kg is traveling in outer space with a velocity of 167 m/s. To alter its course by 38.0^circ, its rockets can be fired briefly in a direction perpendicular to its original
What mass of NaCl must be dissolved in 65.0 grams of water to lower the freezing point by 7.50 °C? The freezing point depression constant, Kfp, for water is -1.86 °C/m.
Calculate the wall shear rate, which is defined as rw = Tw/mu, for each case. What is shear rate at the center line of each these blood vessels?
A 1.0 kg stone is being whirles at constant speed of 12 m/s in a circle, held on a frictionless surface by a steel wire which is horizontal. The wire is 4.0 m long and its radius is 1.0 mm. Find th
A rock is thrown vertically upward from ground level at time t = 0. At t = 1.76 s it passes the top of a tall tower, and 1.23 s later it reaches its maximum height. What is the height of the tower?
If the concentration of potassium chloride in water is 113 ppm, what is the molarity of potassium chloride in water? The molar mass of KCl is 74.55 g/mol. Assume the density of the solution is 1.00
A 29.0 kg child on a 1.00 m long swing is released from rest when the ropes of the swing make an angle of 27.0° with the vertical. Find the child's speed at the lowest position.
A flagpole of length 9 m and mass 35 kg is hinged at one end, where it is connected to a wall as sketched below. The pole is held up by a cable attached to the end. Find the tension in the cable. (A
At 25 °C, what is the osmotic pressure of 8.65 g urea (CON2H4) diluted with water to 1.50 L? (R = 0.08206 L·atm/mol·K)
A low-mass spring is connected between the object and a glange at one end of the rail. Grease on the rail makes static friction negligible, but rapidly damps out vibrations of the sliding object. Wh
Imagine a spider with mass 7.0 x 10-5 kg moving downward on its thread. The thread exerts an upward force on the spider of 1.2 x 10-4 N. What is the acceleration of the spider?
Calculate the frequency of an ultrasound signal if its velocity is 1500 m/s and the wavelength is 7.6 x 10^-3cm
The heat of formation of KCl(s) is -436.7 kJ/mol and the heat of formation of KCl(aq, 1 m) is -419.5 kJ/mol. Determine the heat of solution of KCl.
An 76 quarterback jumps straight up in the air right before throwing a 0.43 football horizontally at 19 .How fast will he be moving backward just after releasing the ball?
A wheel starts from rest on a flat circular track and attains an acceleration of 1.7 m/s2. It completes a quarter distance on a track before going off the track. Calculate the coefficient of static
What is the freezing point of a solution containing 4.78 grams naphthalene (molar mass = 128.2 g/mol) dissolved in 32.0 grams paradichlorobenzene? The freezing point of pure paradichlorobenzene is