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how many grams of calcium carbonate , CaCO3, do you need in an antacid tablet to neutralize 20 ml of stomach acid ? (stomach acid is 0.1 m HCI. there are 3.65 g of HCL in 1 l of stomach acid or 1 g of HCL in 274 g of stomach acid)
76 g of Cr2O3 and 27 g of Al completely react to form 51 g of Al2 O3, how many gram of Cr are formed?
what would the rate constant be at a temperature of 150C for the same reaction described in Part A?
Calculate the pH of a buffer solution that is 0.250 M in HCN and 0.170 M in KCN. For HCN, Ka = 4.9 x 10^-10 (pka = 9.31). Use the equilibirum approach to calculate
A 1L flask is filled with 0.25 mol N2and 0.65 mol H2 at 20 oC. These gases react to make NH3, heating up the flask to a temperature of 45 oC.
Calculate the atomic mass of neon (Ne) which is composed of three naturally occurring isotopes with the following natural abundances and masses
Determine the boiling point of an aqueous solution that is 2.30 m ethylene glycol (C2H6O2); Kb for water is 0.52 degrees celsius/m.
Atomic orbitals merge into molecular orbitals as the atoms move towards each other. What happens with molecular orbitals when the molecule
Iron has a body-centered cubic unit cell, and a density of 7.87 g/cm3. Calculate the edge length of the unit cell, in pm.
A peice of gold (10.0-g, C of Au = 0.129 J/g-K) is heated to 100.0 degrees Celcius. A peice of copper (also 10.0-g C of Cu = 0.385 J/g-K) is chilled in an ice bath to 0 degrees Celcius.
A products, the general rate law is: rate = k[A]2. How long is the third half-life of the reaction if [A]0 is 0.080 M and the first half-life is 22 minutes?
Calculate the minimum wavelength of light (in nm) that could break an oxygen-oxygen double bond given that it takes 499 kJ to break on mole of these bonds.
A chemist dissolves 128 mg of pure hydrobromic acid in enough water to make up of 110 mL solution. Calculate the pH of the solution.
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