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Choose the correct equation for the standard enthalpy of formation of CO(g), where change Hf for CO= -110.5kJ/mol? (gr indicates graphite)
(a) C(gr) + O(g) --> CO(g) changeH = -110.5kJ
(b) C(gr) + CO2(g) ---> 2CO(g) changeH = -110.5kJ
(c) C(gr) + (1/2)O2(g) --> CO(g) changeH= -110.5kJ
(d) 2C(gr) + O2(g) ---> 2CO(g) changeH= -110.5kJ
(e) CO(g) ---> C(gr)+O(g) change H= -110.5kJ
Calculate the work done if a gas is compressed from 7.7 L to 1.3 L at constant temperature by a constant pressure of 2.6 atm, and give your answer in units of joules. (1 L · atm = 101.3 J) J In the above example, work is being done by what?
Calculate the maximum concentration of Ba2+ in water when solid BaCl2 and BaSO4 are present. Calculate whenBaCLs and BaSO4 are seperate and together.
To separate the proteins, you need a separation of at least 1.5 cm between the boundary layers associated with each protein. Using your answer in part b), will it be possible to separate the proteins by centrifugation
a toothpaste contains 0.24% by mass sodium fluoride, NaF and 0.30% by mass of triclosan, C12H7Cl3O2. The mass of one toothpaste is 119g. How many moles of C atoms are in the toothpaste.
Determine ΔSsys separately for the volume and temperature changes and show that ΔSsys=0 for a reversible adiabatic process. Also, if the expansion had instead occurred irreversibly against a constant external pressure of 1 atm
A buffer solution is 0.10 M HAc (acetic acid) and 0.10 M NaAc (sodium acetate) and we have 1.000 Liter of it. What is the pH after 0.010 moles of HCl are added to this solution
What is the concentration of dissolved O2 in blood (or water) at this partial pressure and a normal body temperature of 37C? The solubility of O2 in water at 37C and 1atm partial pressure is 1.93x10^-3 mol/L?
What is the molality of a 25.5% aqueous solution of phosphoric acid, H3PO4 (M = 97.99 g/mol)
A sample of carbon monoxide gas whose mass is 7.75 g is heated from 25 oC to 166 oC at a constant pressure of 5.52 bar.
Calculate the amount of heat liberated (in kJ) from 421 g of mercury when it cools from 91.0°C to 11.0°C.
if 19.65mL of .145M nitric acid is required ti neutralize 50.0mL of barium hydroxide what is the molar concentration of the base? 2HNO3+Ba(OH)2-->Ba(NO3)2+2H2O
What mass (in grams) of CH4 is contained in a 555 mL volume at a pressure of 760.0 torr, and at a temperature of 400.0 K?
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