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Urea, NH2CONH2, is a nonvolatile nonelectrolyte. Calculate the boiling point of a solution of 30.0g of urea in 250g of water
Calculate the percent ionization of propionic acid (C2H5COOH) in solutions of each of the following concentrations
Would the following procedural errors cause an increase, a decrease, or no change in your calculated molecular weight? Indicate clearly the reasoning in each case.
There are four cadmium atoms and four tellurium atoms per unit cell. How many of each type of atom are there in a cubic crystal with an edge length of 5.00 nm?
What is the enthalpy change when 1 mole of ammonia gas is decomposed into its elements?
A solution initially 0.100 M in HOCl and 0.300 M in NaOCl. What is the pH in 0.030 mol of solid NaOH is added to 1.00 L of this solution? Assume no volume channge.
You are given solutions of HCl and NaOH and must determine their concentrations. You use 30.6 mL of NaOH to titrate 100. mL of HCl and 18.0 mL of NaOH to titrate 50.0 mL of 0.0796 M H2SO4. Find the unknown concentrations.
A sample of solid having a density of 3.43 g/cm3 had an apparent mass of 13.9264. The density of the balance weights is 8.00 g/cm3. Calculate the true mass of the object.
A 4.5 g nugget of gold absorbed 276 j of heat. What was the final temperature of the gold if the initial temperature was 25 OC ? The specific heat of gold is 0.129 j/g OC.
The tmeperature s increased to 1200 K, so that all CaC204 decomposes to form CaO according to the reactions, The density of the gas mixture at 1200K was 0.70501 g/L. What was the mass of the calcium oxalate initially placed in the vessl?
During studies of the reaction below, 2 N2H4(l) + N2O4(l) ? 3 N2(g) + 4 H2O(g) a chemical engineer measured a less-than-expected yield of N2 and discovered that the following side reaction occurs
If 29.58 mL of 0.550 M NaOH is required to titrate the oxalic acid in the 0.554g sample to the equivalence point, what is the weight percent of oxalic acid in the mixture. Oxalic acid and NaOH react according to the equation H2C2O4 (aq) + 2 NaOH(a..
At 1.00 atm and 0 °C, a 5.04 L mixture of methane (CH4) and propane (C3H8) was burned, producing 18.0 g of CO2. What was the mole fraction of each gas in the mixture? Assume complete combustion.
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