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A standardized weight obtain from the National Bureau of Standards has the value of 20.000g. While it was used to calibrate a student's top loading balance, the balance showed the following readings; 19.995, 20.005, 20.001. Comment on the precision as well as accuracy of the balance.
A compound contains only carbon, hydrogen and oxygen. Combustion of 7.30 mg of the compound yields 10.68 mg of carbon dioxide and 4.37 mg of water. What is the empirical formula of this compound
Calculate the pH of the solution resulting from the addition of 10.0 mL of 0.10 M NaOH to 50.0 mL of 0.10 M HCN
375.00 mL of a 0.010 M solution of NaCl are condensed down to 167.00 mL. Assuming the solution does not become saturated during this process, what is the final concentration of NaCl
The refractive indices at 20o C of isobutyl bromideand isobutyl choloride are 1.4368 and 1.3785 respectively.Determine the molar composition (in percent) of the mixture byassuming a linear relationship
Assuming that the heat capacities don't change with temperature, how much energy in kilojoules is needed to heat 5.25g of Hg from a temperature of -59.5C to 43.0C
When heated 8.17 g of a salt of hydrated magnesium chloride MgCl2. xH2O, where x represents the number of moles of H2O per mole of MgCl 2, you lose all the water of hydration, leaving 2.50 g of MgCl2. Determine the value of x.
Corrosion is said to be severe if the cell potential is calculated at greater than 0.41 V. Under these conditions, Explain what is the iron(II) concentration on the rebar
While 50 g of acetylene is allowed to react with excess oxygen what is the percentage yield of carbon dioxide
A solution is prepared with initial concentrations of .038 M AL^3+ and .29 M NaF. If the Kf for AlF6^3- is 7.0 * 10^19, what is the concentration of Al^3+ (aq) at equilibrium?
joseph priestley discovered oxygen in the eighteenth century by using heat to decompose mercuryii oxide2 hgos heat
protonated benzoic acid in solution give the Henderson-Hassalbach equation and calculate pH
A sample of 5.53g of Mg(OH02 is added to 25.0mL of 0.200 M HNO3. How many moles of Mg(OH)2, HNO3, and Mg(NO3)2 are present after the reaction
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