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A mass of 2.50 g of hydrated copper(II) sulfate is placed in a crucible and heated. On heating, 1.59 g of whiteanhydrous copper(II) sulfate is left behind. Determine the ratio of water to copper(II) s
Luminol is a reagent used to detect blood at crime scenes. A technician prepares a stock solution by adding 6.0 g of luminol (molar mass=177 g/mol) to 50.0 mL of H2O. What is the molarity of the sto
What is the entropy change for a particle in this system if the final number of microstates is 0.617 times that of the initial number of microstates?
A mixture of 82.0 g of magnesium (24.31 g/mol) and 350 g of iron(III) chloride (162.2 g/mol) is allowed to react. What mass of magnesium chloride (95.21 g/mol) can be formed?
Calculate the molarity of a solution of glycerol made by dissolving 59.000 mL glycerol at 15 degrees celcius in enough water to make 380.00 mL of solution.
Calculate the amount of heat required to completely sublime 68.0 g of solid dry ice {rm{(CO}}_2 ) at its sublimation temperature.
DNA and RNA are polymers of nucleic acids; polysaccharides are polymers of sugars. Give three reasons as to why this strategy may have evolved.
A small cylinder of helium gas used for filling balloons has a volume of 2.30 L and a pressure of 13,800 kPa at 25°C. How many balloons can you fill if each one has a volume of 1.80 L and a pre
The solubility product constant for Ce(IO3)3 is 3.2 *10 ^-10, What is the Ce3+ concentration in a solution prepared by mixing 50.0 mL of 0.250 M Ce 3+ with 50.0 mL of 0.040 M IO3^-?
Calculate the theoretical yield of dry polymer for your positive control weighing (56.794 g), knowing that the starting material is 20% acrylic acid.
Discuss the differences observed in the IR and NMR spectra of LUMINOL and 3-nitrophthal-hydrazide that are consistent with the reduction of the nitro function to an amino group in this experiment.
A sample of 1.518g of KHC8H4O4 was dissolved in water and titrated with an NaOH solution. 26.90 ml were required to reach the equivalence point. Calculate the molarity of the NaOH solution.
A 890 mL sample of NO2 gas is at STP. If the volume changes to 644 mL and the temperature changes to 20ºC, what will be the new pressure in atmospheres?
What is the chemical composition and analysis report, supplier name.It will be transported in capsule or Ms barrel or Flexitank? What is its current market price?
A person ate 0.411 pound of cheese (an energy intake of 3290 kJ). Suppose that none of the energy was stored in his body. What mass (in grams) of water would he need to perspire in order to maintain
What is the pH of the buffer solution (from previous problem posted on [Ch3Nh2] asking of the buffer solution pH) after 5.00 ml of 5.00 M NaOH is added?
Assume you dissolve 0.235 g of the weak acid benzoic acid, C6H5CO2H. What are the concentrations of the following ions at the equivalence point?
Aluminum will react with bromine to form aluminum bromide (Al2Br6). How many moles of Al are needed to form 28.0 mol of Al2Br6?
A coffee-cup calorimeter is calibrated by adding 1840 J of heat to the water in the calorimeter and measuring a 1.72C rise in temperature. When some NH4NO3(s) is added to the same water in the calor
Hess's law can be used to derive the following mathematical equation for determining the heat of reaction for a chemical reaction given heat of formation data.
In an excess amount of oxygen, how many grams of CO2 (g) are theoretically produced from the combustion of 901.0 g of glucose [C6H12O6 (s), molar mass of 180.2 g/mol]?
Suppose 2.8 moles of methane are allowed to react with 5 moles of oxygen? what is the limiting reagent? How many moles of CO2 can be made from this mixture? How many grams of CO2?
Calculate the cell potential after the reaction has operated long enough for the [Al3+] to have changed by 0.32 mol/L. (Assume T = 25°C.)
The heat of fusion of ice (the heat associated with ice melting) is 6.0 kJ/mol. Find the temperature of the coffee after the ice melts.
Which 0.06 m aqueous solution should have the greatest increase in boiling point? Colligative Properties. Choose one answer and why?