Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Solved Assignments
Asked Questions
Answered Questions
An insecticide has the weight percents C=55.6%, H=4.38%, Cl=30.8% and O=9.26%. the approximate molar mass is 345 g/mol. what is the molecular formula?
At 500°C and 93.2 kPa, the mass density of sulfur vapour is 3.710 kg m-3. What is the molecular formula of sulfur under these conditions.
How many grams of Acetylene are produced by adding water to 5 g CaC2?
A compound that has a molecular ion peak in its mass spectrum at mass 94 and shows prominent peaks in its IR spectrum at 3600-3200 and 1600 cm-1. Can we say the compound has a molecular mass of 94?
A sample of iron absorbs 67.5 J of heat, upon which the temperature increases from 21.5 C to 28.5 C. If the specific heat of iron is .450 J/g-K, what is the mass (in grams) of the sample?
Why does the temperature continually decrease as a solution containing solute freezes instead of maintaining a constant temperature as a pure liquid would do?
In an effusion experiment, it was determined that nitrogen gas, N2, effused at a rate 1.812 times faster than an unknown gas. What is the molar mass of the unknown gas?
Calculate the heat released when 211 g of water at 23.0 oC is converted to ice at -10.0 oC. The specific heat of liquid water is 4.184 J/g . oC, the specific heat of ice is 2.09 J/g . oC, Δ
A tank of volume 1.0 m^3 contains 7.3 moles of nitrogen, 5.2 moles of oxygen, 1.5 moles of helium, and 8.1 moles of carbon dioxide at -75 degrees C. Calculate the partial pressure of each gas in the
Suppose an integral membrane protein diffuses in a cell membrane at a rate of 1.04 square centimeters per 0.09 seconds. Express this rate as an integer with the correct number of significant figur
A mixture of ideal gases having a total mass of 16 g is placed in a 13 L vessel at 270.0 K. The equilibrium pressure is measured to be 2.5 bar. Calculate the average molar mass of the gas mixture.
Which compound would have the lowest boiling point?
How many grams of benzoic acid (C6H5COOH) are contained in a 75 mL solution at 0.24 M concentration?
If a temperature increase from 12.0 to 22.0 doubles the rate constant for a reaction, what is the value of the activation barrier for the reaction?
Calculate the free energy difference (?G) at 37oC due to an glucose gradient across the membrane of a phospholipid vesicle. The arginine is moving from an area with a concentration of glucose equal
What concentration of O2 (in grams per liter) can dissolve in water at 37 degrees C when the O2 partial pressure is 40 mm Hg? The Henrys law constant for O2 at 37 degrees C is 1.5x1o^-6 mol/(L-mmH
Distillation is frequently used to isolate the nonvolatile organic solute from a solution containing an organic solvent. Explain how this would be accomplished using a simple distillation.
Magnesium metal reacts with hydrochloric acid to form aqueous magnesium chloride and hydrogen gas. An excess of magnesium is reacted with 20.0 mL of 3.00M and all of the hydrogen is collected in a b
Calculate delta H for the reaction: 2N2O3(g) --> N2O4(g) + 2NO(g)
The alpha-particle bombardment of fluorine-19 generates sodium-22 and neutrons. Write the nuclear equation, including the intermediate compounds.
Calculate the pH of a mixture containing 50 mL of 0.1M NaH2PO4 and 150 mL of 0.1M Na2HPO4. How many mL of 0.1M H3PO4 should be added to the above buffer to lower the pH by one unit?
Interstellar space can be considered as having 10 molecules of hydrogen per cubic centimeter and an average temperature of 2.7 K. Determine the pressure of hydrogen in interstellar space.
Which compound will exhibit the greatest dipole moment?
Determine the equilibrium concentration of carbon monoxide if 0.80 mol of H2 and 0.80 mol of CO2 are injected into a 5.0 liter flask and heated to 1650°C.
How many moles of solid NaF would have to be added to 1.0 L of 1.90 M HF solution to achieve a buffer of pH = 3.35, assume there is no volume change. (Ka for HF = 7.2 x 10-4).