A compound with empirical formula C2H5O was found in a separate experiment to have a molar mass of approximately 90 g. What is the molecular formula of the compound
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A compound with empirical formula C2H5O was found in a separate experiment to have a molar mass of approximately 90 g. What is the molecular formula of the compound?
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- The empirical formula of the sugar glucose is C6H12O6. (a) How many moles are there in 270 g of glucose? (b) Calculate the molarity of a solution of 324 g of glucose dissolved in 2.0 l of water.Ethylene glycol, the main ingredient in antifreeze, contains 38.7% carbon, 9.7% hydrogen and 51.6 % oxygen. Calculate the empirical and molecular formulas for ethylene glycol. Given the molar mass is approximately 60 g/mol. A) Empirical formula: B)Molecular formula: Explain how you obtained the Molecular formula (b)?Compound A has molecular formula C7H7X. Its 1H-NMR spectrum shows a singlet at 2.25 ppm and two doublets, one at 7.28 ppm and one at 7.39 ppm. The singlet has an integral of three and the doublets each have an integral of two. The mass spectrum of A shows a peak at m/z = 126 and another peak at m/z = 128; the relative height of the two peaks is 3:1 respectively. Identify what atom X is, explaining your reasoning and identify Compound A, explaining your reasoning.
- A solution is made by dissolving 9.5 g of sucrose, C12H22O11 (molar mass 342.3 g mol-1) in water to make 250.0 mL of solution. What is the molarity of the solution?Write the molecular formula for the compound that exhbits a molecular ion at M+ = 84.0574. Assume that C, H, N, and O might be present, and use the exact masses below:Derive the Henderson – Hasselbach Equation. [H*][A¯] Ка— [НА] Molecular Weight: H = 1 g/mol C= 12 g/mol N=14 g/mol O = 16 g/mol Cl= 35.45 g/mol
- A solution with a density of 0.876 g>mL contains 5.0 g of toluene 1C7H82 and 225 g of benzene. Calculate the molarity of the solution.A sample of KNO3 ( 225 g) is completely dissolved in water (250 g) at 333.15 K. The solution is gradually colled to 273.15 K. At this coller temperature, KNO3 solubility in H2O is 12.1 g/100 g H2O. What mass of KNO3 (in g) will crystallize out of the solution at 273.15 K?What is the molarity of a NaOH solution if 48.0 mLneutralizes 35.0 mL of 0.144 M H2SO4?
- Lisa and Jisoo wanted to prepare 150 mL of 0.650 M malonate buffer pH 5.00 by mixing NaC4H304 and Na2C3H204. Relevant Reaction: Ка, 3 1.4x10з Kaz = 2.0x10 6 C;H,O4 2 C,H;O4 1. What mass of solid NaC3H3O4 (MM = 138.054 g/mol) and solid Na2C3H2O4 (MM = 148.026 g/mol) will be needed to prepare the buffer? a. mass of solid NaC3H3O4 needed: b. mass of solid NazC3H2O4 needed: gWhat is the pH of a solution of 4.1 x 10-8 M NaOH in otherwise pure water?What is the pH of stomach acid, a solution of HCl with a hydronium ion concentration of 1.2 × 10−3 M?