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When 24 copper pennies are submerged in water, the pennies displace 8.26 cm3 of water. If the combined mass of the pennies is 73.86 g, what is the density of copper?
A reaction in water causes the water in beaker to cool from 25 degrees Celsius to 21 degrees Celsius. The volume of water 150ml (d=1.0g/ml). What is the heat absorbed by the reaction?
Water's heat of fusion is 80. , its specific heat is 1.0, and its heat of vaporization is 540 . A canister is filled with 350 of ice and 100. of liquid water, both at 0 . The canister is placed in a
An aqueous solution contains 12.7% NaCl by mass. What mass of water (in grams)is contained in 2.5L of the vapor above this solution at 55 celcius? the vaor pressure of pure water at 55 celcius is 11
What mass of sucrose should be combined with 478 of water to make a solution with an osmotic pressure of 8.60 at 320 ? (Assume the density of the solution to be equal to the density of the solvent.
What are the lewis dot structures for k2so4, Ca3N2, C6H14, C2H4, CH3CH2, OOOH
how many calories of heat energy was absorbed? Express our answer numerically in calories using two significant figures.
Suppose that 0.82 g of water condenses on a 80.0 g block of iron that is initially at 24 C.If the heat released during condensation goes only to warming the iron block, what is the final temperatur
an automobile gasoline tank holds 21 kg of gasoline. When gasoline burs, 81 kg of oxygen is consumed and carbon dioxide and water are produced. What is the total combined mass of carbon dioxide and
A solution of ethanol (C2H5OH) in water is prepared by dissolving 63.5 mL of ethanol (density = 0.79 g/cm3) in enough water to make 250.0 mL of solution. What is the molarity of the ethanol in this
A sealed balloon is filled with 1.00 L of helium at 23 degrees celsius and 1.00 atm. The baloon rises to a point in the atmosphere where the pressure is 220 torr and the temperature is -31 degrees c
What is the simplest formula for Chalcocite if a sample of this ore contains 8.274 g copper and 2.088 g sulfur?
Consider the nitryl cation,NO2+. Write all possible Lewis structures for this ion. Draw the molecule by placing atoms on the grid and connecting them with bonds.
Write net Brønsted equations that show the acidic or basic nature of the following substances, given the pH. For polyprotic acids, only show one proton transfer. Remember that spectator ions
The atomic mass of element X is 33.42 amu. A 21.83-g sample of X combines with 80.32 g of another element Y to form a compound XY. Calculate the atomic mass of Y.
A piece of lead is placed into a graduated cylinder. The level of the liquid rises from 235 to 305 mL. What is the mass in grams of the lead if the density of lead is 11.3g/cm3?
Find the mass of the sugar (C6H12O6) required to produce 1.82 L of carbon dioxide gas at STP from the reaction?
A hypothetical metal has a face-centered cubic unit cell and a density of 6.12 g/cm3. The molar mass of the metal is 143.2 g/mol. What is the atomic radius of this metal?
How much heat (in {rm kJ}) is evolved in converting 1.00 {rm mol} of steam at 160.0^circ C to ice at -55.0^circ C?
Calculate the mass of one atom in grams. Calculate the mass of all atoms in one unit cell in grams. How many atoms are contained in one unit cell of of this element?
Your friend decides to decrease cooking time for spaghetti noodles by adding table salt to 2.0 L water. How much table salt (NaCl) must be added to the water in order to raise the boiling point by 4
How much heat is produced in burning 7 mol of {rm{C}}_2 {rm{H}}_2 under standard conditions if both reactants and products are brought to 298 {rm K}?
If the aluminum block is initially at 25, what is the final temperature of the block after the evaporation of the alcohol?
A proton in a linear accelerator has a de Broglie wavelength of 115 rm pm. What is the speed of the proton?