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A 25.0-mL sample of potassium chloride solution was found to have a mass of 25.115g. When the solution was heated to dryness, the mass of the solute residue was 0.252g. Calculate the (a)mass/mass % concentration and (b) molar concentration.
Until 200 yr ago, manufactured iron contained charcoal produced from freshly cut wood that was added during the smelting process. As a result of this practice, older samples of iron can be dated accurately using the carbon-14 method
Microwave ovens use microwave radiation to heat food. The microwaves are absorbed by moisture in the food, which is transferred to other components of the food. As the water becomes hotter
A sample of iron was heated to 148.0°C, then placed into 368 g of water at 23.6°C. The temperature of the water rose to 27.2°C. How many grams of iron were in the sample
If a bottle of nail polish remover contains 181 mL of acetone, how much heat would be released by its complete combustion? The density of acetone is 0.788 g/mL.
For many reactions near room temperature, the rate and the rate constant approximately double for a 10 °C rise in temperature. What is the value of activation energy in kJ/mol for such a reaction?
Both acetylene (C2H2) and benzene (C6H6) can be used as fuels. Which compound would liberate more energy per gram when combusted in air
The mixture is 20% benzene by volume. A densitometer gives the density of the mixed stream to be 1.1 g/mL. What are the mass fractions of all three species?
How many grams of IKI (iodine-potassium iodide; molar mass = 166.0 g/mol) would it take to obtain a 100.0 mL solution of 0.300 M IKI? How many grams of IKI would it take
A compound is 40.0%C, 6.70%H, and 53.3%O by mass. Assume that we have a 100.g sample of this compound. What are the subscripts in the empirical formula of this compound?
One mole of N2 and three moles of H2 are placed in a flask at 375 C. Calculate the total pressure of the system at equilibrium if the mole fraction of NH3 is 0.21. The Kp for the reaction is 4.31*10^4.
Calculate the mass of Zinc hydroxide (Zn(OH)2) that will dissolve in 500ml of pure water. The solubility constant for zinc hydroxide is 4.2*10^-17
A gaseous reaction occurs at a constant pressure of 50.0 atm and releases 67.9kJ of heat. Before the reaction, the volume of the system was 8.80L . After the reaction, the volume of the system was 2.80L .Calculate the total internal energy change ..
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