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To make up a solution of phosphate buffered saline (PBS), you need 5mM Na2HPO4 (anhydrous) (FW: 141.96), 0.15 M NaCl (FW: 58.44), and 1 mM KH2PO4 (FW: 136.09). How many grams of each will you need to make up 500mL of PBS?
A solution is prepared by dissolving 18.536g of calcium nitrite in 183.544g of distilled water. Calculate the boiling and freezing points of this solution.
The element boron has two naturally occurring isotopes with masses of 10.0129 amu and 11.0093 amu. What is the percent abundance of the second isotope?
What is the pH of a solution that is 6.5×10-2M in potassium propionate and 8.5×10-2M in propionic acid?
a photon of wavelength 40.0nm is used to eject an electron with the energy 22.3eV from a molecule.calculate the ionization energy of the molecule and tha associated wavelength of the elctron..
The mass percent of a three component gas sample is 58.0% C2H4O2, 14.6% NH3 and 27.4% CH2O. Calculate the partial pressure (atm) of CH2O if the total pressure of the sample is 0.340 atm.
ammonia is made industrially by reacting nitrogen and hydrogen under pressure at high temperature and in the presence
unknown concentration of sodium hydroxide for complete neutralization. What is the molarity of the sodium hydroxide solution?
a 255-mL sample of a HCl solution reacts with excess Ca to produce 14.0 L of H2 gas at STP. what is the molarity (M) of the HCl solution? Ca(s) + 2HCl(aq) > CaCl2(aq) + H2(g)
A flask contains 0.260 mol of liquid bromine, Br_2. Determine the number of bromine molecules present in the flask.
Carbon disulfide is prepared by heating sulfur and charcoal. The chemical equation is S2(g)+C(s) CS2(g) Kc=9.40 at 900K How many grams of CS2(g) can be prepared by heating 16.4 moles of S2(g)
consider a sample containing 5 mol of a monatomic ideal gas taken from state a to state b. calculate changeE, changeH,q, and w.
when 64.5 g of hcl are allowed to react with 17.6 g of o2 50.4 g of cl2 are collected. determine the limiting reactant
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