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The first ionization energy of magnesium is 738 kJ/mol, the second ionization energy of magnesium is 1451 kJ/mol, and the electron affinity for chlorine is -349 kJ/mol. Prove mathematically using Hess's Law that the formation of magnesium chloride from magnesium metal and chlorine gas is exothermic.
You will also need:Cl2(g) --> Cl(g) Heat formation = 121.7 kJ/mol
Mg(s) --> Mg(g) Heat formation = 147.1 kJ/mol
boron has two naturally occuring isotopes,, 10B (19.9%) and 11B(80.1. althought the b2 molecule doesn not exist naturally on earth, it been been produced in the laboratory and been observed in stars..
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Iodine-131 is a radioactive isotope. After 9.00 days, 46.0% of a sample of 131I remains. What is the half-life of 131I
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calculate the quantity of heat in calories release when 241.62 g of water is cooled from 80.6degc to
1)When CH4(g) reacts with H2O(g) to form H2(g) and CO(g), 206 kJ of energy are absorbed for each mole of CH4(g) that reacts. Write a balanced thermochemical equation for the reaction with an energy term in kJ as part of the equation.
A solution of sodum hydroxide is standardized against potassium hydrogen phthalate (molecular mass = 204.224 g mol-1). From the following data, calculate the molarity of the NaOH solution.
What will be the pH at the equivalence point when a 100 mL sample of 0.25 M NH3 titrated with 0.15 M HCl at 25 degrees C? (Kb for NH3 = 1.8 x 10-5)
A 4.867 g sample of a monoprotic acid was dissolved in water. It took 30.24 mL of a 0.1578 M NaOH solution to neutralize the acid. Calculate the molar mass of the acid.
Given the following information A+B-> 2D deltaH=-637.1 KJ deltaS=336.0 J/K C -> D deltaH=544 KJ deltaS=-233.0 J/K calculate ?G° for the following reaction at 298 K. A+B->2C DeltaG=? KJ
Assume that the estimates of the standard deviation for the mean mass of a series of three measurements, a serious of six measurements, and a series of nine measurements were identical.
1. In a plot of absorbance verus time, what are the units for the slope 2. Assuming a pathlength of 1 cm
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