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when an irregularly shaped chunk of silicon weighing 8.763 g was placed in a graduated cylinder containing 25.00 mL of water, the water level in the cylinder rose to 28.76 mL. What is the density of silicon in g/cm3?
The digital thermometer is miscalibrated by +0.15C over its entire range. If the same thermometer is used in part B.2 will the reported moles of solute
A sample of gas occupies a volume of 400 mL at 0.740 atm and 70 oC. Calculate the pressure of the gas if its volume is changed to 360. mL while its temperature is held constant.
1)WhenH2(g)reacts withC2H4(g)to formC2H6(g),137kJ of energy areevolvedfor each mole ofH2(g)that reacts. Write a balanced thermochemical equation for the reaction with an energy term in kJ as part of the equation.
a sample of sodium reacts completely with 0.142kg of chlorine forming 234g of sodium chloride. what mass of sodium
The Lyman series in the hydrogen atom corresponds to transitions that originate from the n=1 level in absorption or that terminate in the n=1 level for emission. Calculate the energy, frequency, and wavelength of the least and most energetic transiti..
Calculate the ratio of the potential energies for the interaction of a water molecule with an Al3+ ion (of radius 53 pm) and with a Be2+ ion (of radius 27 pm).
During an experiment, a student mixed 14.5 mL of a .5 M sodium flouride solution with 15.6 mL of a .750 M hydrofluoric acid solution. The measured pH was 3.24. Calculate the pKa.
What is the molar mass of 35 g of an unknown substance that depresses the freezing point of .350 kg of water .50°C? Kf for water is 1.86C/m.
Calculate the pressure, in atmospheres, of 3.94 mol CO(g) in a 4.25 L tank at 31 degrees C.
A 1.0 liter sample has a solids concentration of 1600 mg/L and is allowed to settle for 1 hour. After one hour the top 550 mL of water is removed and found to have a solids concentration of 25 mg/L. What is the solids concentration in the water re..
It takes 48.0 to raise the temperature of an 9.10 piece of unknown metal from 13.0 to 25.0. What is the specific heat for the metal?
a sample of nitrogen gas occupies 1.55 L at 27.0 C and 1.00 atm pressure. What will the volume be -100 C and the same pressure?
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