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Find the number of moles of water that has been lost from MgSO4.7H2O, when you heat 2.9560 g of this hydrate to give the anhydrous MgSO4. Molar mass of MgSO4.7H2O = 246.5 g/mol and molar mass of H2O
A truck on a straight road starts from rest, accelerating at 2.00 m/s2 until it reaches a speed of 42.0 m/s. Then the truck travels for 56.0 s at constant speed until the brakes are applied, stoppi
An oil-filled capacitor has square parallel plates 23 cm on a side, separated by 0.48 mm. When the capacitor is charged to 88 V , the stored charge is 7.7 uC (micro Coulomb's). Find the dielectric
Calculate the density of a volatile liquid in its gaseous state at pressure = 752.0 mm Hg, and temperature = 99.5 0C , if its molar mass is 84.0g/mol; R = 0.0821 atm.l / mol.K.
When a non-volatile solute dissolved in water the freezing point of the solution is lowered while its boiling point is increased. Give a practical example from our life on both cases.
You have three 3.0 uF capacitors. Two of the capacitors are in parallel, and this parallel combination is in series with the third capacitor. This capacitor combination is connected across a 30-V ba
Would you xpect the α-protons of a thioester to have a lower or higher pKa than an ester? Why? Remember the pKa values for the α-protons of several FG's: aldehyde(17), ketone(21), ester(
If water at the top of the falls is at 16.4°C, what is the maximum temperature of the water at the bottom of the falls? Assume all the kinetic energy of the water as it reaches the bottom goes i
Calculate the percent of radioactive parent atoms remaining 2 hours after medicine is administered. The percent is the fraction x 100%.
The three capacitors C=2.0 uF (micro F) in parallel are connected across a 30-V battery. A). Find the charge on each capacitor. B). Find the potential difference across each.
A string vibrates at its third-harmonic frequency. The amplitude at a point 30 cm from one end is half the maximum amplitude. How long is the string?
Double stranded DNA molecule negatively charged with a charge density of -e per nanometer 1. what is the electric field due a DNA molecule at a distance of 10 nm?
The strings make an angle of 30 with rod. A) What is the tension in the lower string Tl ?
Would you be willing to back financially an inventor who is marketing a device that she claims takes in 25000J of heat at 600K, expels heat at 300K, and does 12000J of work? Explain.
A one mole sample of an ideal gas with a Cv=1.5R, initially at 320K and 1 atm pressure is allowed to undergo an reversible is othermal expansion against a constant external pressure of 0.5atm.
A rocket rises vertically, from rest, with an acceleration of 3.2 m/s^2 until it runs out of fuel at an altitude of 870 m. After this point, its acceleration is that of gravity, downward. Velocity
If 500 J of work are required to carry a 40 C charge from one point to another, the potential difference between these two points is:
Calculate the equilibrium constant for the reaction at that temperature of at equilibrium the partial pressures are PSO2 = PNO2 = 0.50 atm, and PNO = PSO3 = 2.0 atm.
A metal sphere of radius 20 cm has a net charge of 6.0 x 10-8 C. (a) What is the electric field at the sphere's surface? (b) If V = 0 at infinity, what is the electric potential at the sphere's surfac
What is the excess charge on a conducting sphere of radius r = 0.36 m if the potential of the sphere is 1050 V and V = 0 at infinity?
How will the fist mL of distillate from the simple distillation differ from the first mL distillate of the factional distillation? If the thermometer bulb is placed too high how will this affect you
An empty hollow metal sphere has a potential of +470 V with respect to ground (defined to be at V = 0) and has a charge of 5.8 10-9 C. Find the electric potential at the center of the sphere.
Calculate the osmotic pressure of a magnesium citrate laxative solution containing 30.0 g of magnesium citrate in 251 mL of solution at 37 degrees C.
Still not sure which equation to use. Asked previously and feel the answer was not right. Stone thrown vertically upward with a speed of 24 m/s. How fast is it moving when it reaches a height of 20.
Calculate the osmotic pressure of a magnesium citrate laxative solution containing 26.5 of magnesium citrate in 220 of solution at 37 (approximate body temperature). Assume complete dissociation of