A student performed the experiment described in this module, using 5.00 mL of a 3.2% H2O2 solution with a density of 1.52g mL-1. The water temperature was 18 ° C, and the barometric pressure in the laboratory was 30.1 in. Hg. After the student immersed the yeast in the peroxide solution, she collected 85.3 mL of O2. (11) Calculate the percent error for the experiment.
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- A student performed the experiment described in this module, using 7.00 mL of a 1.8% H2O2 solution with a density of 1.01 g mL-1. The water temperature was 20 ° C, and the barometric pressure in the laboratory was 30.02 in. Hg. After the student immersed the yeast in the peroxide solution, she collected 45.1 mL of O2. (11) Calculate the percent error for the experiment. What is the observed molar volume?A student performed the experiment described in this module, using 4.00 mL of a 3.5% H2O2 solution with a density of 1.61 g mL-1. The water temperature was 25 ° C, and the barometric pressure in the laboratory was 30.40 in. Hg. After the student immersed the yeast in the peroxide solution, she collected 79.20 mL of O2. (7) Calculate the mass of H2O2 in 5.00 mL of the H2O2 solution.When treating a mixture of metals( copper and zinc) with an excess of solution of hydrochloric acid, 2.24 liters of a gas(STP) were released. When the same mixture was treated with phosphoric acid precipitate of 93.5g is formed. Find the mass fraction of metals in the initial mixture.
- The average concentration of chloride ion in seawater is 19.353g Cl-/kg. The world health organization recommends that the concentration of Cl- ions in drinking water not exceed 250ppm. How many times as much chloride ion is there in seawater than in maximum concentration allowed in drinking water?The aluminum in a 1.200 g sample of impure ammonium aluminum sulfate was precipitated with aqueous ammonia as the hydrous Al(OH)3.xH2O. The precipitate was filtered and ignited at 10000C to give anhydrous Al2O3 which weighed 0.1798 g. Express the result of this analysis in terms of % Al2O3.Following the irrigation of salted soils, 10,000 L of salty irrigation runoff was filtered by a reverse osmosis (RO) treatment plant generating 7,000 L of pure water for return to a local river. Following RO treatment, the brine (left-over salt solution) concentration was 1.95 M NaCl. What was the hydrostatic pressure (atm) required by the RO plant to filter this volume of the salty irrigation runoff at a temperature of 20.0 oC?
- the partial molar volumes of acetone and chloroform in a mixture in which the mole fraction of CHCl3 is 0.4693 are 74.166cm3/mol and 80.235 cm3/mol, respectively. What is the volume of a solution of mass 1.000 kg?What is the gravitational force of attraction for two protons separated by 75 pm?Given the following mixture of two compounds 25.00 mL of X (MW =82.00 g/mol)(density 1.013 g/mL) and 620.00 g of Y (65.00 g/mol))(density 0.816 g/mL), calculate the mole fraction of X.
- Describe the preparation of 500 mL of 2.45%(v/v) aqueous ethanolThe vapor pressures of two volatile organic compounds, compound 1 and compound 2, at 20 °C are 79.2 torr and 194.7 torr, respectively. What is the gas phase mole fraction of compound 2 above a solution containing an equimolar mixture of the two compounds?Please enter your response in standard notation to three significant figures.What is the Normality of a sulfuric acid solution containing 75% w/v of H2SO4 (98.0) and having a density of (1.520g/ml)?