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Metallic iron has a bcc structure at 20 C and a density of 7.8 g/cm3. What is the length of the side of the unit cell for iron and what is the atomic radius?
Markings to indicate length are placed on a steel tape in a room that is at a temperature of 22°C. Measurements are then made with the same tape on a day when the temperature is 27°C. Are th
The element rhenium (Re, atomic number 75) has two naturally occurring isotopes, Re-185 (mass = 184.935 amu) and Re-187 (mass = 186.956 amu). Calculate the percent abundances of the isotopes of r
What uniform magnetic field, applied perpendicular to a beam of electrons moving at 2.3 x 106 m/s, is required to make the electrons travel in a circular arc of radius 0.45 m?
The element bromine at room temperature is a liquid with a density of 3.12g/ml calculate the mass of 125 ml of Bromine. What volume does 85.0 g of bromine occupy?
Two toy locomotives approach each other along the same line, and upon collision both stop dead still. One locomotive has three times the speed of the other and the sum of their masses is 4.98 kg. A
What would be the vapor pressure at 25.0 °C of a solution of 5.00 g of glucose (C6H12O6) in 100.0 g of ethanol (C2H5OH)?
The current in a coil with a self-inductance of 1 mH is 3.0 A at t = 0, when the coil is shorted through a resistor. The total resistance of the coil plus the resistor is 9.0 Ohms. (a) Find the curr
A rock is tossed off the top of a cliff of height 34.5m. its initial speed is 29.1m/s and the launch angle is 30.2degrees with respect to the horizontal. what is the speed with which the rock hits t
A sample of solid having a density of 3.43 g/cm3 had an apparent mass of 13.9264. The density of the balance weights is 8.00 g/cm3. Calculate the true mass of the object.
Describe in detail how you would prepare a solution with a concentration near 0.100 M from a 0.650 M stock solution. Calculate the final concentration of the diluted solution (it won't be exactly
How much concentrated solution would you take to prepare 2.85 of 0.570 by mixing with water? HCl is purchased in 37% mass and has a density of 1.20 g/mL.
A student in a parked car honks the horn, which has a `proper' frequency of 310 Hz. An observer in an approaching vehicle measures the frequency of the sound to be 333 Hz. Calculate the speed of the
A block mass 15.92kg supported by a vertical massless cable is initially at rest. The block is then pulled upward with a constant acceleration of 2.11m/s^2. What is the net force acting on the mass?
If 50.0 grams of iron(III) oxide were mixed with 50.0 grams of aluminum, what maximum mass of iron metal could be produced?
An electric motor rotating a workshop grinding wheel at a rate of 9.70 101 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 1.60 rad/s2.
Silver Nitrate reacts with sodium chloride to form solid silver chloride and sodium nitrate. How many grams of Sodium nitrate formed when 0.230 grams of sodium chloride react?
What would be the boiling point of acetone (AHvap = 32.0 kJ/mol) at this elevation? What would be the vapor pressure of acetone at 25.0°C at this elevation?
Commercial grade HCL solutions are typically 39.0% (by mass) HCL in water. Determine the molality and molarity of the HCL, if the solution has a density of 1.20 g/ml.
A 100g iron ball (specific heat=0.473 J/gC) is heated to 125C and is placed in a calorimeter holding 200g of water at 25C. What will be the highest temperature reached by the water?
The first-order reaction A products has a half-life, t1/2, of 46.2 min at 25°C and 2.6 min at 102°C. Calculate the activation energy of this reaction.
Draw the three isomers of benzenedicarboxylic acid
Calculate the molarity and the molality of an NH3 solution made up of 30.0 g of NH3 in 70.0g of water. The density of the solution is 0.982 g/mL. (Notice that we are using both molarity and molality
What is the density of the atom in grams per cubic centimeter? Assume the nucleus is a sphere with volume =(4/3)pi r^3.
A 6-year-old girl standing on a toy chest throws a doll straight up with an c of 16 feet per second. The height h of the doll in feet t seconds after it was released is described by the function h(t