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The bitter-tasting compound quinine is a component of tonic water and is used as a protection against malaria. It contains only C, H, N and O. When a sample of mass 0.487 g was burned, 1.321 g of carbon dioxide, 0.325 g of water, and 0.0421 g of nitrogen were produced. The molar mass of quinine is 324 g/mol. Determine the empirical and molecular formulas of quinine. (Type your answer using the format CO2 for CO2 and use the order CHNO) empirical molecular
A solid sample containing some Fe^2+ ion weighs 1.062 g. It requires 24.12 mL 0.01562 m KNno4 to titrate Fe^2+ in the dissolved sample to a pink end point. How many moles MnO4- ion are required
A 0.6815g sample of alum is heated to drive off the waters of hydration, and the resulting KAL(SO4)2 weighs 0.3709 g. Determine the value of x AND the complete formula of alum.
What volume of chlorine gas is produced when 0.952 mol of hydrochloric acid reacts completely according
The temperature of the calorimeter rose from 25C to 33.73C. If the heat capacity of the calorimeter was 9,630 J/C, what is the value of delta H for the combustion reaction in KJ/mol.
A sample of water vapour at 200 degrees C is compressed isothermally from 350 cm^3 to 120 cm^3. What is the change in its molar Gibbs
What mass of C2H5OH should be added to 535 kg of the paraffin in formulating the mixture if the vapor pressure of ethanol at 35°C over the mixture is to be 8 torr? The vapor pressure of pure ethanol at 35°C is 100 torr.
How many moles of HNO3 are present in 35.0 mL of a 4.50 M solution of nitric acid?
A 757 mL gas sample at STP is compressed toa volume of 202 mL, and the temperature isincreased to 30 degrees C. What is the new pressureof the gas in Pa?
When 28 mL of a 430 mL stock solution containing 2.3 M AlCl3 is diluted to 114 mL, how many moles of Al3+ are in the new solution?
CaCN2 + 3 H2O → CaCO3 + 2 NH3 . How much NH3 is produced if 187 g of CaCO3 are produced?
Using curved arrows to show electron movement and bond formation write a reaction mechanism for the acid catalyzed reaction
The dipole moment (mu) of HBr (a polar covalent molecule) is 0.82 D (debye), and its percent ionic character is 12.1%. Estimate the bond length of the HBr bond in picometers.
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