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When one mole of benzene (C6H6) undergoes complete combustion, 3,170 kJ are released. Calculate the combustion energy of 0.350 kg of benzene?
A calorimeter contains 125 g of water at 26.1°C. A block of metal with a mass of 25 g is heated to 96.5°C and then placed in the water in the calorimeter. After sufficient time,
Given a 0.250 M K2CrO4 Stock Solution, describe how you would prepare a solution that is 0.0125 M K2CrO4. That is, what combination(s) of pipet and volumetric flask would you use? Typical sizes of
The vapor pressure of carbon tetrachloride, CCl4, is 0.354 atm and the vapor pressure of chloroform, CHCl3, is 0.526 atm at 316K . A solution is prepared from equal masses of these two compounds at
1.0 mol of CaCN2 and 1.0 mole of water are mixed together: CaCN2 + 3 H2O → CaCO3 + 2 NH3 How much NH3 could be produced?
A 2.0-kg mass is projected vertically upward from ground level with an initial speed of 30 m/s. The mass rises to maximum height of 35 m above groud level. how much work is done on the mass by air r
List these molecules in order of increasing dipole moment: H2O, CBr4, H2S, HF, NH3, CO2
If 3.98 g of copper was recovered and you started with 9.10 g of copper (II) chloride, then what is the percent yield of the reaction?
What is the change in pH when 0.005 moles of HCl is added to 0.100 L of a buffer solution that is 0.100 M in CH3CO2H and 0.100 M NaCH3CO2? The Ka for acetic acid is 1.8 x 10-5.
A daredevil is shot out of a cannon at 25° to the horizontal with an initial speed of 35 m/s. A net is positioned a horizontal distance of 87 m from the cannon. At what height should the net be
What mass of natural gas {rm{(CH}}_4 ) must you burn to emit 271 kJ of heat?
A modern chealting agent used for this purpose is succimer (C4H6O4S2). What minimum mass of succimer in miligrams is needed to bind all of the lead in a patients bloodstream?
write a balanced formation equation at standard conditions for the compound HI.
Calculate change in enthalpy for the following reactions:
A physics student stands on a bathroom scale in an elevator which is not moving. The scale reads 620 N. The elevator then accelerates downward at 1.36 m/s2. What does the scale read during this acc
The final temperature of the mixture is 30.4?C. What is the specific heat capacity of the metal? Assume that there is no energy lost to the surroundings.
Write and balance the double replacement reaction of sodium hydroxide and oxalic acid(H2C2O4). How many moles of base are needed to neutralize one mole of acid? (H2C2O4 <=> 2H^+ + C2O4^2-)
A reaction vessel contains these compounds at equilibrium. What will happen if the volume of the container is reduced by 50% at constant temperature?
Calculate the number of representative particles for 0.150 mol NaCl
A gas expands and does P-V work on the surroundings equal to 323 J. At the same time, it absorbs 145 J of heat from the surroundings. Calculate the change in energy of the gas.
A magnetic computer disk 9.44 cm in diameter is initially at rest. A small dot is painted on the edge of the disk. The disk accelerates 520.0 rad/s2 for 0.500s, then coasts at a steady angular veloc
If 141 mL of wet H2 is collected over water at 24°C and a barometric pressure of 738 torr, how many grams of Zn have been consumed?
10.00 mL of a solution containing 0.17 M NaCl and 0.23 M AlCl3 is introduced into a fully charged cation exchange column. How many moles of hydronium ions will be released by the column?
The wavelength corresponding to threshold frequency to tungsten surface is 230nm. Calculate the kinetic energy of the photoelectron ejected from the surface of tungsten metal,if it is irradiated wi
A 125 mL sample of dry air at 230 degrees celcius is cooled to 100 degrees celsius at constant pressure. What volume will the dry air occupy at 100 degrees celsius?