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Problem- If the weight limit for a roof is 55 lbs/ft^2, how many inches of snow can be on the roof before it must be removed? Again assume that 10 inches of snow is equivalent to 1 inch of liquid water if melted. Liquid water is 62.4 pounds/cu-foot (lbs/ft^3)
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The concentration of Pb2+ in a commercially available standard solution is 1.000 mg/mL. What volume of this solution should be diluted to 6.0 x 10^2 mL to produce a solution in which the concentation of Pb2+ is 0.0505 mg/L? in Homework Help
A 25.0-ml sample of potassium chloride solution was found to have a mass of 25.115 g. When the solution was heated to dryness, the mass of the solute residue was 0.252 g. Calculate the mass/mass percentage concentration and molar concentration.
the following density measurements were made on a bar of iron 7.58 gml 8.02 gml 7.83 gml 7.80 gml and 7.66 gml. the
Balance the chemical equation when aqueous ammonium phosphate and aqueous calcium choloride are mixed. What is the sum of the coefficeints?
benzoic acid c7h6o2 burns in oxygen to form carbon dioxide and water. the dhcombustion of the reaction is measured to
What is the change of molar Gibbs energy for the freezing of water at -10C? The vapor pressure of H2O (liquid, -10C) is 286.5Pa. The vapor pressure of H2O (solid, -10C) is 260Pa. At -10C the molar volume of supercooled water
A student started the purification and recrystallization with a crude sample of adipic acid that weighed 20.421 g and obtained a yield of pure adipic acid of 73.5% How much pure adipic acid was recovered
Write complete and balanced net ionic equations for the reaction that occurs between the following pairs of reagents. If no reaction occurs, so state.
question 1 which of the following correctly shows a neutralization reaction between a hydronium ion and a hydroxide
The hydration of norbornene and the bromination of trans-cinnamic acid are both examples of additions across a double bond. The norbornene reaction work-up involved using a separatory funnel to extract the product while the work-up of the brominat..
What is the buffer-component ratio, [Pr - ]/[HPr], of a propanoate buffer that has a pH of 5.57 (Ka of HPr = 1.3 multiplied by 10-5)
The total molarity of acid and conjugate base in this buffer is 0.100 M . A student adds 5.90 mL of a 0.380 M HCl solution to the beaker. How much will the pH change. The pKa of acetic acid is 4.760.
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