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Discuss these two types of chemical reactions, exothermic and endothermic.
Explain how many grams of aluminum oxide will be produced if we react 30.0g of Al with 25 g of oxygen gas. State and balance chemical equation first
Calculate the mass percent of a solution that is prepared by adding 32.2 g of NaOH to 262 g of H2O.
The enthalpy of combustion of lactose, C12H22O11, is -5652 kJ/mol. A 2.50 g sample of lactose was burned in a calorimeter that contained 1350 g of water. The heat capacity of the calorimeter is 1630 J/oC, and the initial temperature was 24.58oC. W..
A 1.17-g sample of a mixture of cyclohexane (C6H12) and naphthalene (C10H8) is dissolved in 17.9 g of benzene (C6H6). The freezing point of the solution is 2.2°C. Calculate the mass percent of the mixture.
A mole of CH4 expands reversibly from 1 to 50 L at 25 degrees Celsius. Calculate the work in Joules assuming 1) the gas is ideal and 2) the gas obeys the van der Waals equation. For CH4 (g), a = 2.283 L^2 bar mol^-2 and b = 0.04278 L mol^-1
A 773 mL sample of NO2 gas is at STP. If the volume changes to 648 mL and the temperature changes to 15ºC, what will be the new pressure in atmospheres
the edge length of the unit cell of potassium metal k is 533 pm the unit cell is body-centered cubic one atom at each
What mass of sucrose should be combined with 462 of water to make a solution with an osmotic pressure of 8.30 at 270 ? (Assume the density of the solution to be equal to the density of the solvent.)
when cooncentrated cacl2 aq is added to na2hpo4 aq a white ppt forms that is 38.7 ca by mass. write a net ionic
The dissolution of ammonium nitrate occurs spontaneosly in water 25 degrees celcius. As NH4NO3 dissolves, the temperature of the water decreases. What are the signs of Delta H, Delta S, and Delta G for this process
A sample of neon is compressed from a volume of 65.0 L to a volume of 13.0 L by an external pressure of 12.0 bar at constant temperature. The neon gains 17.4 kJ of heat. Calculate ?U for the neon gas.
Consider a stoppered flask containing benzene, iodine, and air, which has reached equilibrium at 298K. Which one of the following statements concerning the system at equilibrium is true?
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