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Based upon 3 SnF2 (ag) + 2 K3PO4 (aq)> Sn3(PO4)s (s) + 6 KF (aq), a 10.000 gram sample of toothpaste containing stannous fluoride gives a 0.145 gram precipitate of stannous phosphate. What is the percentage of SnF2 in the toothpaste sample?
The average molecular weight of the protein by gel permeation is 525000 g mass/g mol. Calculate the mole fraction of each component in solution.
Consider the equilibrium represented by the following equation: Heat + H2O(l) H2O(g) in which T=373K, P=101kPa Which of the following will favour the reverse reaction? (a) The total volume of the system is increased
The specific heat of fat is 0.45 cal/(g C) and the density of fat is 0.94g/cm^3 . How much energy (in calories) is needed to heat 10cm^3 of fat from room temperature (25 C) to its melting point (35 C).
What are the molality and mole fraction of solute in a 29.3 percent by mass aqueous solution of formic acid (CH3OH)?
The results below are from a titration lab utilizing 25mL of .1M acetic acid which was titrated with the NaOH solution of volume and molarity shown below. Please show how to get the correct pH at equivalence to compare with indicator change
A certain microwave oven delivers 702 watts (J/s) of power to a coffee cup containing 67.5 g of water at 25°C. If the wavelength of microwaves in the oven is 9.75 cm
When calculating the density of your regularly shaped object, which measurement will limit your final result?
KEtones also undergo the aldo condensation, although a succesful reaction often requires "enhanced" conditions, since the addition involves an unfavorable equilibrium constant.
How many milliliters of a stock solution of 2.00M KNO3 would you need to prepare 100.0 mL of 0.150M KNO3?
Calculate the mass of propylene glycolC3H8O2 that must be added to 0.320kg of water to reduce the vapor pressure by 2.88torr at 40C Pressure H2O 40C 55.3torr
An unknown element, X, reacts with chlorine to form a compound with the formula XCl2. Which element is most likely to be element X?
If it takes 30.0 mL of 0.0250 M K2Cr2O7 to titrate 15.0 mL of a solution containing Fe2+, what is the molar concentration of Fe2+?
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