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If a 5.0g KBr sample, at 25 degree C, dissolves in 25.0 mL of water, also at 25 degrees C. The final equilibrium temperature of the resultant solution is 18.1 degree C. Explain what is the enthalpy change. Hs, in joules per gram and kilojoules per mole of KBr?
calculate the ph of solution formed by mixing 150 ml of 0.10m hc7h5o2 with 100 ml of 0.30m nac7h5o2. the ka for hc7h5o2
what is the freezing depression if .25 moles of sodium chloride was dissolved in 350ml of
A gas follows the equation of state PV = nRT(1+aP) where 'a' is a constant. For this gas, show that a = 1/T and K = 1/(P(1+aP) and verify that (dP/dT)v = a/K
determine the mass in grams of water that will result in a change in energy of 2.54 kj when water reacts with excess
1. what is the sulfate ion concentration in a 12 maqueous solution of mnso4 2?2. calculate the molar concentration of
What is the minimum number of conversions that need to be done across a peak to achieve a reproducibility (relative standard deviation) of less than 1% for repeated measurements of the same peak
How many gigagrams of niobium contain the same number of atoms as 12.5 nanograms of vanadium
A tank initially at a pressure of 6.70 atm contains 2.0 moles of oxygen gas at 25.0 degrees celsius. Its temperature is then increased to 45.0 degrees celsius
nanowires are high aspect ratio metal or semiconducting wires with diameters on the order of 1-100 nanometers and
Naturally occurring gallium consists of two isotopes. One of those isotopes is 71Ga with an isotopic mass of 70.9247050 amu and an abundance of 39.892%. What is the mass number of the other isotope
What volume of 1.40M NaOH solution must you add in order to prepare an acetate buffer of pH = 4.83? (The pKa of acetic acid is 4.76).
talc is a mineral that has low conductivity for heat and electricity and that is not attacked by acid. it is used as
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