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Epsom salt is a hydrate with a formula MgsO4.xH2O, where x indicates the number of moles of H2O per mole of MgSO4. After a 1.687 g sample of the hydrate is heated, 0.824 of MgSO4 remains. How many molecule of water are present per formula unit of MgSO4?
orbitals in two dimensions indicating the Cartesian coordinates appropriate to the drawing and identity these orbitals as being of sigma or pi symemetry.
A buffer solution is composed of 1.360 g of KH2PO4 and 5.677 g of Na2HPO4. What is the pH of the buffer solution?
Calculate the mass percent of carbon in the compound and calculate What is its final temperature
A buffer is formed by mixing 100 mL of 0.1 M NH4Cl with 50 mL of 0.3 M NH3. To this solution 12 mL of 0.1 M NaOH is added. What is the approximate pH of the new solution after neutralization? Assume a Kb of 1.8 × 10^-5 for the weak base.
Calculate the pH and the concentrations of all species present H3O+, F-, HF, Cl-, OH- in a solution that contains 0.10 M HF Ka = 3.5*10^-4 and 0.10 M HCl.
Which of the following statements is true regarding chiral carbons with R configuration? a. plane polarized light is rotated clockwise b. plane polarized light is rotated counterclockwise
A mutant hemoglobin has His146 of the beta chain replaced with a threonine residue. predict what the consequence of this mutation might be. specifically
exhibits Kc = 0.0302 at 342 K. If the standard enthalpy change for this reaction is 10.0 kJ/mol, what is the value of Kc for the following reaction
A gaseous mixture has a volume of 240L and a pressure of 1.35atm at 24*C. The mixture is 67% He and 33% Kr by mass. What is the mass of Kr
how much energy is liberated when 366 g of mercury (c=0.139j/g degrees celsius)cools from 77.0 C to 12.0 degrees celsius?
Determine the root-mean-square speed of CO2 molecules that have an average kinetic energy of 4.21*10^(-21) J per molecule.
Silver chloride, often used in silver plating, contains 75.27% Ag by mass. Calculate the mass of silver chloride required to plate 155 mg of pure silver.
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