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A 45- piece of ice at 0 is added to a sample of water at 12. All of the ice melts and the temperature of the water decreases to 0. How many grams of water were in the sample?
Small helium-neon lasers emit 3.50 mJ/s of light at 634 nm. How many photons does such a laser emit in one minute?
A 13 mL sample of a solution of Pb(ClO3)2 was diluted with water to 17 mL. A 15 mL sample of the dilute solution was found to contain 0.027 moles of Pb2+. What was the concentration of Pb(ClO3)2 in
A an aqueous methanol (CH3OH) solution has a mole fraction of 0.525 of methanol. What mass of water would be present in 890. g of this solution?
A current of 2.40 A is passed through a solution containing Cu2+(aq) for 30.0 minutes, with copper metal being deposited at the cathode. What mass of copper, in grams, is deposited? The reaction at
How many of the following changes wouldalter the numerical value of the equilibrium constant Kp for the reaction 2OF2(g) --> O2(g) + 2 F2(g)? I) an increase in temperature II) a decrease of the c
0.115 mole of CH4 was placed in a 1.00 L container. At equilibrium it was found that the [C2H2] = 0.035 M. What is the value of the equilibrium constant?
Insulin is a protein that is used by the body to regulate both carbohydrate and fat metabolism. A bottle contains 475 of insulin at a concentration of 30.0 . What is the total mass of insulin in the
Many gases are shipped in high-pressure containers. Consider a steel tank whose volume is 65.0 L and which contains O2 gas at a pressure of 16500 kPa at 21 degrees C.
A solution is 40% acetic acid by mass. The density of this solution is 1.049 g/mL. Calculate the mass of pure acetic acid in 480 mL of this solution at 20 C.
Calculate the theoretical amount of 3 M sodium hydroxide needed to convert the benzoic acid (half the weight of the sample) to its water - soluble salt.
Based on molecular structure, arrange each of the following sets of molecules in order of increasing acidity. Explain your answer for each in one or two complete sentences.
What is the molarity of a solution created by dissolving 75.3 grams of sodium carbonate in enough water to create 2.50 liters?
Such a compound has a melting temperature of 1775 °C. What type of bonding do you think is involved in this compound? Give your reasoning.
What advantage does such compartmentalization offer a large cell and what are two examples of oraganelles and the activities they compartmentalize?
An auto technician spills 85 mL of 2.6 M H2SO4 solution from a rebuilt auto battery. How many milliliters of 2.5 M NaHCO3 must be poured on the spill to react completely with the sulfuric acid, making
calculate avaerage rate of decomposition of H2O2 between 0 & 4.32 x 10^4 s.
Suppose 321 grams of methylamine (CH3NH2) and 332L of oxygen gas are mixed together in the reaction below at STP. how many grams of water should be prouduced?
A 48.4 mL sample of gas in a cylinder is warmed from 19 degrees Celsius to to 88 degrees Celsius. what is its volume at the final temperature?
A .350 g sample of a biomolecule was dissolved in 15.0 g of chloroform, and the freezing point depression was determined to be .240 degree celcius. Calculate the molar mass of the biomolecule?
A liquid unknown was found to be soluble in cyclohexane and alcohol; the unknown was found to have a boiling point of 58 C at 670 mm Hg. What is the substance? What could you do to confirm your answ
Under water where the temperature is 17C and the pressure is 394 kPa, a diver inhales 2.1 L of air from his SCUBA tank.
WebAssign will check your answer for the correct number of significant figures. 4Your answer was incorrect, but has changed from what was graded.%
Calculate the molarity and mole fraction of acetone in a 1.06 m solution of acetone (CH3COCH3) in ethanol (C2H5OH). (Density of acetone = 0.788 g/cm3; density of ethanol = 0.789 g/cm3.) Assume that