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Determine the chemical formula and R number of the following refrigerants :
a) pentachloroethane,
b) trichloroethane, and
c) octafluoropropane.
CaHbClcFd ia refrigerant number: R-(a-1)(b+1)d, where c=2(a+1)-b-d.
how many moles of NH4Cl are necessary to prevent the precipitation of magnesium hydroxide (neglect change in volume due to addition of NH4Cl)? The solubility product for Mg(OH)2 is 1.5× 10-11, and the Kb for ammonia is 1.8 × 10-5.
Suppose that the spin quantum number, ms could have three allowed values instead of two. How would this affect the number of elements in the first four rows of the periodic table?
A reaction mixture consists of 0.50 atm nitrogen, 0.75 atm hydrogen and 2.0 atm ammonia. Go for the reaction is -33.32 kJ/mol. Calculate the G at 298 K for the reaction between nitrogen and hydrogen to form ammonia, N2 + 3 H2 --> 2 NH3
What is the mass of 3.20 moles of magnesium chloride,MgCl2 ? Express your answer with the appropriate units. mass of MgCl2 =
Calculate the cell potential for the following reaction as written at 69 °C, given that [Mg2 ] = 0.876 M and [Fe2 ] = 0.0160 M. Standard reduction potentials can be found here.
what is the percent yield of a reaction in which 228 g phosphorus trichloride reacts with excess water to form aqueous
How much silver iodide, AgI, in grams will dissolve in 1200 ml of pure H2O at 25 degrees Celcius when the system reaches equilibrium
The "roasting" of 48.7 g of ZnS at constant pressure gives off 220. kJ of heat. Calculate the DH for this reaction. 2ZnS(s) + 3O2(g) ® 2ZnO(s) + 2SO2(g)c
Explain How to compute the number of grams of calcium chloride that can be prepared from 4.25 grams of calcium. Ca(s) + HCl -> CaCl2(aq)+H2(g) (unbalanced)
Determine the pH of a solution when 26.8 mL of 0.15 M HNO3 is mixed with 20.1 mL of distilled water
A 1.000 L steel tank is fitted with a safety valve that opens if the internal pressure exceeds 1.00 x 103 torr. It is filled with helium at 19.5 °C and 0.924 atm and then placed in boiling water at exactly 100°C. What is the pressure in atm in the..
The Ka of HNO2 is 7.1 x 10^-4. Use this to find the volume (mL) and pH of 0.0588 M KOH needed to reach the equivalence point(s) in titrations of 28.5 mL of 0.0380 M HNO2.
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