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A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4 , for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 425 ml of a solution that has a concentration of Na^+ ions of 1.40 M? Express your answer numerically in grams.
0.1278- sample that is 97.50% As2O3 by mass had been used in the titration, how many milliliters of the 0.02140M KMnO4(aq) would have been required?
When 20.0 g of a metal is placed in 9.0 mL of water, the volume increases to 14.5 mL. What is the density of the metal
Laboratory experiment produces volatile compound in gaseous form. You need to collect this sample by adding just enough cryogen (cooling agent) into a rigid vessel to condense your compound as liquid
What mass (in grams) of O2 is contained in a 555 mL volume at a pressure of 760.0 torr, and at a temperature of 400.0 K?
What salt is formed in the reaction between 0.13 mol H3PO 4 and 0.26 mol KOH? 2.51 moles of a gas occupies 50.88 liters, and its density is 1.43 g/L at a particular temperature and pressure. Calculate the molar mass of the gas.
calculate the pH of this solution after the addition of 4.46 mL of 5.9 M nitric acid. The Kb of ethylamine is 6.4x10-4 some help would be awesome
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
Calculate the wavelength of light that is produced when the excited electron relaxes back tro ground state. givien sodium is the excited element
the geometric angle between the two bonds that connect an alpha-carbon to its nearest neighbors on the polypeptide
A 5.50 g sample of an unknown is dissolved in 251. g of benzene. The freezing point of the solution is 1.02 C below the normal freezing point of pure benzene.
What are the coefficients of the reactants and products in the balanced equation above? Remember to include H2O(l) and H+(aqu) in the appropriate blanks.
Assuming that the tablet contained only calcium carbonate and an inert binder calculate the mass of calcium carbonate and mass percent of calcium carbonate.
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