What is the concentration of the unknown {\rm{H}}_3 {\rm{PO}}_4 solution? The neutralization reaction is: {\rm{H}}_3 {\rm{PO}}_4 (aq)\; + \;3\;{\rm{NaOH}}(aq)\; \to \;3\;{\rm{H}}_2 {\rm{O}}(l)\; + \;{\rm{Na}}_3 {\rm{PO}}_4 (aq)

Consider filling a gas cylinder with ethane from a high-pressure supply line. Before filling, the cylinder is empty (vacuum). The valve is then opened, exposing the tank to a 3-MPa line at 500 K until the pressure of the cylinder reaches 3 MPa. The valve is then closed. The volume of the cylinder...

A sample of 1.72 grams of compound Y is burned completely in a bomb calorimeter which contains 2500 g of water. The temper- ature rises from 24.237 C to 24.593 C. What is Urxn for the combustion of compound Y? The hardware component of the calorimeter has a heat capacity of 3.47 kJ/...

what are the ion concentrations in a .12 M solution of BaCl2

A student prepared a stock solution by dissolving 20.0 g of KOH in enough water to make 150. mL of solution. She then took 15.0 mL of the stock solution and diluted it with enough water to make water to make 65.0 mL of a final solution. What is the concentration of KOH for the final solution?

A calorimeter contains 29.0 of water at 11.5. When 1.80 of (a substance with a molar mass of 55.0 ) is added, it dissolves via the reaction and the temperature of the solution increases to 30.0. Calculate the enthalpy change, , for this reaction per mole of . Assume that the...

a sample of a gas at 0.75 atm occupies a volume of 521 mL. If the temperature remains constant, what will be the new pressure if the volume increases to 776 mL.?

What mass of NaOH is needed to precipitate the Cd^{2+} ions from 32.0 mL of 0.480 M Cd(NO3)2 solution?

What is the density (in ) of hydrogen gas at 20.0 and a pressure of 1670 ?

how many atoms of H are in 0.184 moles of (c3h5)2O