, A solution is formed by dissolving 73.0 g of urea, CO(NH2)2, in 300.0 mL of water at 25oC. What is the mole fraction of urea in this solution? Group of answer choices A, 0.0680 B, 0.932 C, 0.680 D, 0.0340
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- An energy storage system is being designed using a number of concrete blocks and electrically driven carriages, each carriage has a mass 10 000 kg, which can be raised to a certain height using electric motor driven trains using excess power from a combined solar-wind farm. Power is recovered using the same motors and releasing the concrete blocks and carriages. If the excess energy on one day is 2 GJ, the maximum height is 200 m and the efficiency is 100%, how many carriages are needed to store this energy (assume g = 10 m/s²). 4 B C O E 5 20 50 100 200ABC The table below shows the number of each kind of atom that makes up one molecule of sucrose and one molecuke of ethanol. Number of Atoms per Molecule Molecule Carbon Oxygen Hydrogen Sucrose 12 11 22 Ethanol 11 Based on this information, which of the following is the same for both molecules? The size of each molecule The types of atoms in each molecule The number of atoms in each molecule The physical and chemical properties of each molecule @2021 lluminate EducationTM, Inc.2. Calculate the freezing point depression of a solution containing 0.125 mol of a non- electrolyte solute dissolved in 0.250 kg water. Kf= 1.86°C/m
- N2 + 3H2 → 2NH3 How many moles of hydrogen, H2, are needed to react with 2.0 moles of nitrogen, N2?Find the percentage by mass of the elements in strontium sulfide SrS (to the nearest 1%) Omit the % sign. a. Strontium b. Sulfur « Previous MacBook Prowrite the balanced chemical equation for P+O2=P2O5
- 29. A solution containing 90% by volume of alcohol (in water) runs at 1 gal/min into a 100-gal tank of pure water where it is continually mixed. The mixture is withdrawn at the rate of 1 gal/min. When will it start coming out 50% alcohol?For the reaction 2 H₂O → 2 H₂ + O2, how many moles of O2 are produced with 2.90 moles of H₂? Your answer should have 2 decimal places.Arsenic acid is a triprotic acid with the pKa values pKa = 2.240, pK2 = 6.960, and pK 11.500. You wish to prepare 1.000 L of a 0.0100 M arsenate buffer at pH 6.380. To do this, you choose to mix the two salt forms involved in the second ionization, NaH, AsO, and Na, HASO,, in a 1.000 L volumetric flask and add water to the mark. What 4 mass of each salt will you add to the mixture? mass NaH, AsO, = mass Na, HASO, en
- Choose the correct number of molecules in a moleof: Gold V Choose.. 197 Water 6.02 x 10 23 18 Hydrogen Choose...help4. For the reaction, H2 + Br2 2HB1, a proposed reaction mechanism is given below: Br2 → 2Br. (fast) Br. + H2 – + HBr + H. (slow) Br2 + H. HBr + Br: (fast) Br + Br- Br2 (fast) If the above reaction mechanism is correct, what will be the rate law for this reaction?