Pb (NO3) 2 10. A compound is 42.3 % C, 5.94 % H, 32.9 % N, and 18.8 % O and has a molecular mass of 425.25 g/mol. Calculate the empirical and molecular formula. C15H25N10O5 11. How many moles of Al2O3 are produced by the reaction 200. g Al?
This seems to be a disregard for human life. From a human rights perspective, Ford disregarded the injured individual's rights and therefore, in making the decision not to make adjustments to the fuel system, acted unethically. The suggested improvement outweighs their benefits; they do not want to bear the cost. Ford could bargain with manufacturer for a lower cost of alteration of the tank, then maybe they can change their mind and pinto wouldn’t burn so many people
Determine the percent yield of this reaction, showing all steps of your calculation. (3 points) heoretical yield of H2 gas: (1.156 x 10^-3 moles)(1 mole H2/ 1 mole Mg) = 1.156 x 10^-3 moles Theoretical mass: (1.156 x 10^-3 moles)(2.02 g/mole) = 2.335 x 10^-3 g Using ideal gas law: P = (1.1 atm)(760 torr / 1 atm) - 19.8 torr = 816.2 torr V = 0.026 L T = 295 K Solve for n: n = PV/(RT) n = (816.2 torr)(0.026
1. 25 cm3 of a solution of 0.1 moldm-3 NaOH reacts with 50 cm3 of a solution of hydrochloric acid. What is the molarity of the acid? 2. 25.0 cm3 of a 0.10 moldm-3 solution of sodium hydroxide was titrated against a solution of hydrochloric acid of unknown concentration.
1 mole of water B. 2 moles of water C. 3 moles of water D. 2 moles of water with 1 mole of hydrogen left over 8. Ten kilograms of hydrogen gas (H2) are mixed with 355 kg of chlorine (Cl2) in a 0.50 m3 drum. The two gases react to produce hydrogen chloride. What is the final pressure in the drum if the final temperature is 60oC?
3) The reason for the fact that the solvent used in an extraction should have a low boiling point is so that the solvent itself can evaporate out of the mixture. This allows for the extraction or the drawing out of the compounds so that they could be studied more effectively. 4) The extraction process would be more difficult as the higher polarity of the solvent would cause less immiscibility with water because water is also a polar substance and so there would not be a clear and defined separation of the solvents. This makes it difficult to drain of the bottom aqueous layer and to continue with the extractions. Also, the solvent dimethylformamide would take longer to evaporate due to its higher boiling point and would take a long time to continue with the experiment.
How many moles of gas does it take to fill a 1.0 L flask at a pressure of 1.5 atm at 100 celsius? (.049 mol) 2. What is the atmospheric pressure if the partial pressures of nitrogen, oxygen and argon are 604.5 mm Hg, 162.8 mm and .5 mm respectively? (767.8 mm Hg) 3. Describe the
To do that we had to count the molar mass (M) of zinc sulfate. Then we multiplied the amount of zinc sulfate in moles with the molar mass. Then the answer was the mass (m) of the zinc sulfate to add in grams. M(ZnSO4) = (65.38 + 32.06 + 4 x 16.00) g/mol = 161.44 g/mol n (ZnSO4) = 0.02 mol M (ZnSO4) = 161.44
Empirical formula: CH5N Steps for molecular formula: 1- Calculate the molar mass of the empirical formula. 2- Divide the known (given) molar mass by the calculated empirical formula molar mass to get a whole number 3- Multiply that whole number through subscripts of the empirical formula to obtain the molecular formula. Example CH5N 12.01 g C x 1 C= 12.01 g/mol 1.008 g H x 5 H = 5.040
One of them was the inability to remove the impurities from the magnesium ribbon. As a result, the mass of MgO and the mass of O decrease. Also the number of moles of MgO decreases which in the end, the ratio between the magnesium and and oxygen increases. This error can be reduce by sanding more efficiently as much as