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When this mixture is dissolved in 150. g of water, the freezing point is found to be -2.24 degrees C. Calculate the percent by mass of sugar in the original mixture.
The plot of ln[A] versus time yields a straight line with slope -0.0045 s^-1. Determine the following: 1. The value of the rate constant.
Octane has a density of 0.692 grams per centimeter cubed at 20 degrees celcius . How many grams of oxygen molecules are required to burn 4.54 decimeter cubed of octane?
If 56.0 g of mercury(II) oxide is heated and 26.0 % decomposes, what is the pressure of oxygen gas in a 621 mL container at 25oC?
Iron has a density of 7.874. g/cm3. What is the mass of a rectangular block of iron with dimensions of 3.000 cm by 4.000 cm by 5.000 cm?
A zero-order reaction has a constant rate of 2.90×10-4 M/rm s. If after 65.0 seconds the concentration has dropped to 9.00×10-2 M, what was the initial concentration?
How much limestone must be decomposed by heating to produce 150.0 grams of lime, CaO?assuming that the limestone contains 85.0% pure CaCO3.
Potassium chlorate,decomposed when heated to produce potassium chloried and oxygen gas. If 2.50 grams od KCLO3 were heated in test tube, how many grams of oxygen gas should be given off?
The volume of a gas bag was found to be 840 mL at a temperature of 25 degrees C and a pressure of 734 torr. What would be its volume at STP?
Calculate the molarity and mole fraction of a 1.43 m solution of acetone (CH3COCH3) dissolved in ethanol (C2H5OH). (Density of acetone = 0.788 g/cm3; density of ethanol = 0.789 g/cm3.) Assume that t
Benzoyl chloride, C6H5COCl, reacts with water to form benzoic acid, C6H5COOH, and hydrochloric acid. This first-order reaction is 25% complete after 26 s. How much longer would one have to wait in o
A 11.7 mL sample of a HCl solution has a pH of 2.000. What volume of water must be added to change the pH to 4.000?
A gas is heated from 268 K to 290 K while its volume is increased from 25.0 L to 37.0 L by moving a large piston within a cylinder. If the original pressure was 0.90 atm, what would be the final pre
A 55.0 gram piece of ice at 0.0 C is added to a sample of water at 8.0 C. All of the ice melts and the temperature of the water decreases to 0.0 C. How many kilograms of water were in the sample?
What mass of this substance must evaporate in order to freeze 119 of water initially at 24? (The heat of fusion of water is 334 the specific heat of water is 4.18 .)
What would happen if a solid was dissolved in a liquid at 100 degrees and then the temperature dropped to 70 degrees?
The lethal inhalation does of sarin for a 200lb person has been determined to be 0.0015 mg. Determine the LD50 of sarin that researchers used to calculate this lethal inhalation does.
Calculate the mass of solid AgNO3 that can be added to 2.0L of a 0.10 M K2CrO4 solution in order to just start precipitation.
Making ice cream involves surrounding the ice cream canister with a bath of salted ice water. To get the mix to freeze at 7.00ºC, how many grams of salt (NaCl; molar mass = 58) will you need t
A rigid container of O2 has a pressure of 340 kPa at a temperature of 713 K. What is the pressure at 273 K?
Sodium benzoate (C6H5COONa) is used as a food preservative. Calculate the pH of a 0.050 M solution of this salt. Ka for benzoic acid is 6.5 x 10-5
Suppose you wanted to heat a mug of water (250 mL) from room temperature 25 C to 100 C to make a cup of tea. How much energy (in units of calories and joules) would you need from your microwave?
using percent yield, how many grams of Aluminium must be used to react with an excess of hydrogen phosphate to produce 35.8g of aluminum phosphate?
Calculate the amount of heat required to completely sublime 34.0g of solid dry ice at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3KJ/mol .
a 150 ml buffer solution containing 0.100 M hydrocyanic acid (HCN ka=6.2 x 10^-10) and .100 M soudium cyanide (NaCN) has 30.0 mL of .120 M KOH added to it. What is the pH of the solution after the