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A known compound has a melting point range of 134-137 degrees C. You record a melting point point range of 125-126 degrees C for a sample. IS this sample a pure compound?
Question- How long will it take to produce 78.0 g of Al metal by the reduction of Al3+ ions in an electrolytic cell with a current of 2.00 amperes? ( Al: 26.98 g/mol)
Ammonium sulfide in solid form decomposes to ammonia gas and hydrogen sulfide gas. It is a reversible reaction The Kp at 25 degrees C is .109 In an experiment Ammonia gas and hydrogen sulfide gas each have a partial pressure of .5 atmospheres and ..
The molar enthalpy of fusion of ice at 0 0C is 6.02 kJ/mol; the molar heat capacity of supercooled water is 75.3 J/molK. (a) One mole of supercooled water at -10 0C is induced to crystallize in a heat-insulated vessel.
calculate the heat of reaction for 2PbS +3O2 yields 2PbO +2SO2 given the following information. PbS= -93.3 kj/mol. PbO=-219.7. SO2=-296.6. O2 = 0. I got -846kj, is that correct
Which reaction responds more strongly to changes of temperature, one with an activation energy of 52 kJ mol-1 or one with an activation energy of 25 kJ mol-1
A galvanic cell is formed by connecting an iron (III)/ iron metal electrode to a zinc (II)/ zinc metal electrode through a suitable salt bridge.
The mass of the dry gas is 872 mg. A fragment of the tank indicates that the gas is a monoatomic element. Write out the full name of the gas.
In a solution containing the following dissolved species, which would contribute positively to alkalinity. Explain
You have discovered a new element with an atomic weight of 260 g/mol and a density of 30 g/cm3. If the atoms pack on a BCC lattice what is the hard sphere atomic radius R (in nm)
how many grams of potassium are present in 13.6g of K2Cr2O7
Calculate from your titration results the moles of acidic protons in the tablet neutralized by the NaOH.
Calculate the pH, [CH3CH2NH2], and [CH3CH2NH3+] at the following stages of the titration. i) before the addition of any HI solution. ii) after the addition of 20.0 mL of HI solution. iii) at the equivalence point. iv) after the addition of 60.0 mL..
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