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Describe how to prepare 50.0mL of 5.30 x10-2 M solution from pure drug and water. Calculate the number of grams of drug to be weighted for this solution
At 25 ºC, the vapor pressure of water is 23.8 torr. What is the vapor pressure of a solution prepared by dissolving 97.0 g of C6H12O6 (a nonvolatile solute) in 170 g of water.
The decomposition of potassium chlorate (KClO3 ) is used as a source of oxygen in the laboratory. How much potassium chlorate is needed to produce 24.1 mol of oxygen?
The half-life for the radioactive decay of [U]-238 is 4.5 billion years and is independent of initial concentration. Part A How long will it take for 20% of the [U]-238 atoms in a sample of [U]-238 to decay?
A stock solution is prepared by adding 25 mL of 2.2 M AlCl3 to enough water to make 75 mL. What is the Cl- concentration of 25 mL of the stock solution.
What volume of pure oxygen gas (O2) measured at 546 K and 1.00 atm is formed by complete dissociation of 0.7 mol of Ag2O? 2 Ag2O(s) → 4 Ag(s) + O2(g)
Write the balanced net ionic equation for this reaction. How many H+ are there in the balanced equation?
A balloon 15m in diameter is inflated with helium at 20 degrees Celsius. How much work is done during inflation against an external pressure 1atm.
Determine compound having greater Ksp or compound having smaller Ksp ? compute [Ag + ] when CuI just start to precipitate. What % of Ag + remains in solution at this point?
What is the pH of a buffer that results when 0.50 mole of Na3PO4 is mixed with 0.75 mole of HCl and diluted with water to 1.00 L? The acid dissociation constants for phosphoric acid
Consider all the valence electron pairs of the central atom-both those that are shared in covalent bonds, called bonding pairs, and those that are unshared, called non-bonding pairs or unshared pairs.
A 578 mL sample of hydrogen gas was collected over water at 25°C and a pressure of 783 torr. If the pressure of water vapor is 24.0 torr at 25.0°C, what mass of hydrogen gas (g) was collected?
if 135 g of steam at 100 degrees C and 475 g of ice at 0 degrees C are combined, what is the temperature of the resultant water, assuming that no heat is lost?
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