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a sample of Mg was burnt in air to give a mixture of Mgo and Mg3N2 . The ash was dissolved in 60 Meq of Hcl and the resulting solution was back titrated with NaOH . 12Meq of NaOH were required to reach the end point. An excess of NaOH was then added and the solution distilled . the ammonia released was then trapped in10 Meq of second acid solution. Back titration of this solution required 6 Meq of the base . Calculate the % of Mg burnt to the nitrate.
Explain what is the molarity of a solution of acetic acid H(C2H3O2), if 35.00ml is titrated to the end point with 68.20 ml of 0.750 M KOH
A ground state H-atom absorbs a photon of wavelength 61.15 nm, and its electron attains a higher energy level. The atom then emits two photons: one of wavelength 3043 nm to reach an intermediate level, and a second to reach the ground state.
a sample of gas occupies 12 liters under a pressure of 1.2 atm. what would its volume if the pressure were increased to 2.4 atm? assume the the temperature of the gas does not change.
A solution which contains 41.0 g of an unknown molecular compound in 312 g of water freezes at -2.23°C. What is the molar mass of the unknown?
Could temperature, amount of water or any other factors effect the pH levels of two separate samples of neutral water
Calculate the change in enthalpy for the CHCl3 sample and change in entropy for the CHCl3 sample. Finally, Calculate the change in entropy for the reserve and change entropy of the universe.
Calculate the wavelength (in picometers) associated with hydrogen atom moving at a speed of 3.13 x 10^3 cm/s
For the blanced equation, shown below, What would be the limiting reagent if 67.6 grams of H2S were reacted with 55.9 grams of O2. 2 H2S (g) + 3 O2 (g) --> 2 SO2 (g) + 2 H2O (g)
1)The standard electrode potential for the reduction of Eu3+(aq) to Eu2+(aq) is ?0.43 V. determine which of the following is capable of reducing Eu3+(aq) to Eu2+(aq) under standard-state conditions. (a) Sn2+(aq) (b) ln(s) (c) HCN(aq) (d) La(s)
The ionization constants for sulfurous acid are Ka1 = 1.4*10^-2 and Ka2 = 6.3 * 10^-8. Species that need to be calculated (Molarity):
what is the molecular formula of a compound that contains 28.2% of potassium ,25.6% of chlorine and 46.2% of oxygen ? the molar mass is 138.5u.
oes this result mean that the change in enthalpy of this process must be negative in order for the process to be spontaneous under standard state conditions? How come?
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