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The vapor pressure of pure water at 20 degrees Celsius is 17.5torr. Explain what is the vapor pressure at 20 degrees above a solution that has 85.5 g of sucrose C12H22O11 and 75 g of urea [CO(NH2)2] dissolved per kg of water?
Dissolving 3.00 g of an impure sample of CaCO3 in an excess of HCl acid produced .656 L of CO2 (measured at 20 degrees C and 792 mmHg). calculate the percent by mass of calcium carbonate in the sample. State any assumptions.
plasma is the fluid portion of blood. the concentration of acetylsalicylic acid aspirin c9h8o4 molar mass 180.0 gmol
A sample of nitrogen gas occupies 1.55 L at 27.0 degrees Celsius and 1.00atm. What will the volume be at -100.0 degrees Celsius and the same pressure?
A voltaic cell is constructed in which the cathode is a standard hydrogen electrode and the anode is a hydrogen electrode (P(H2)= 1atm) immersed in a solution of unknown [H+].
For the following pairs of orbitals, indicate which orbital is lower in energy, and give a brief explanation why. a) sulfur 3p vs. sulfur 3d
Suppose a 80-kg person drinks 3 L of water every day for 80 years with a arsenic concentration of 50 microgram/L. PF for arsenic is 1.75 (mg/kg-day)-1. Find the daily average dosage.
Compound (CH3)2CCHCH3 contains 85.63 g carbon per 100.0 g compound. Calculate the mass (g) of a sample of (CH3)2CCHCH3 if it contains 148.9 g of carbon.
Write the expression for the equilibrium constant. b. Which way would the reaction shift in each of the following cases?
What mass of formaldehyde gas must be released from building materials to produce a concentration of 50 ppm of the gas in a room with dimensions of 4m*5m*2m?
An airplane is pressurized to 650 {rm mm,Hg}, which is the atmospheric pressure at a ski resort at 1.30×104 {rm ft} altitude. If the partial pressure of oxygen drops below 100 {rm mm,Hg}, passengers become drowsy.
What molar ratio of benzoate ion to benzoic acid would be required to prepare a buffer with a pH of 5.20? [Ka(C6H5COOH) = 6.5 × 10-5]
How many grams of sodium azide are needed to provide sufficient nitrogen gas to fill a 35.0x35.0x25.0 cm bag to a pressure of 1.20 atm at 26 degress C.
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