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A mixture of table salt and ice is used to chill the contents of hand-operated ice-cream makers. What is the melting point of mixture of 2.00 lb of NaCl and 12.00 lbs of ice if exactly half of the ice melts? Assume that all the NaCl dissolves in the melted ice and that the van' Hoff factor for the resulting solution is 1.44.
If the copper is drawn into wire whose diameter is 8.50 mm , how many feet of copper can be obtained from the ingot? The density of copper is 8.94 g/cm^3 .
The specific heats of ice and water are 2.09 and 4.184 J/g.°C, respectively. The heat of fusion for water is 334 J/g.
When 1.025 g of naphthalene is burned in a bomb calorimeter, the temperature rises from 24.25 to 32.33 degrees celsiuc. What is the delta E reaction?
What is the final temperature in a squeezed cold pack that contains 41.0 g of NH4NO3 dissolved in 125 mL of water? Assume a specific heat of 4.18J/g*C for the solution, an initial temperature of 26.5C.
What is the molar concentration of sodium hydroxide solution if a titration involved 0.0058 mole NaOH and 31.87 ml of sodium hydroxide.
Calculate the molar solubility of FeCO3 . How many grams of FeCO3 are present in 15.0 L of a saturated solution.
The activation energy of a certain reaction is 45.3kJ/mol . At 24{~}^{\circ}\rm C , the rate constant is 0.0160s^{-1} . At what temperature in degrees Celsius would this reaction go twice as fast?
Statements correctly describe(s) the relationship between the structure of a fatty acid and its melting point? a. Saturated fatty acids have melting points that increase gradually with molecular weight.
Determine how many grams of the following solutes would be needed to make 550 mL of a 0.700 M solution.
Determine how much heat is evolved or absorbed when 40.0 of lithium iodide completely dissolves in water.
By mass spectral analysis, a sample of strontium is known to contain 2.64x1010 atoms of Sr-90 as the only radioactive element. The absolute disintegration rate of this sample is measured as 1238 disintegrations per minute. Calculate the half-life ..
The density of lead is 11.3 g/ml. The water level in a graduated cylinder initially at 220mL rises to 297mL after a piece of lead is submerged. What is the mass in grams of the lead?
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