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When 5.0 g of an unknown substance is dissolved in 100.0 g of water, the freezing point of the solution decreases by 1.5 degrees Celsius.
How much heat is gained by Nickel when 500g of Nickel is warmed from 22.4 deg C to 58.4 deg C? (The specific heat of Nickel is 0.444 J/(g dot Celcius)
If 12.354 g of sodium thiosulfate penthahydrate is actually used to make the titrnt solution (500 mL), what is the actual molarity of the sodium thiosulfate solution?
A 0.1964 g sample of quinone(C6H4O2) is burned in a bombcalorimeter that has a heat capacity of 1.56 kJ/°C. Thetemperature of the calorimeter increases by 3.2°C.
A benzene - toulene solution with xben = .300 has anormal boiling point of 98C. The vapor pressure of pure tolene at98.6C is 533mmHg. What must be the vapor pressure of pure benzeneat 98.6C?
Nitrogen is collected over water at 21 degrees Celsius (vaporpressure of water is equal to 2.5 kPa). What is the partialpressure of nitrogen if the atmospheric pressure is 99.4 kPa?
Carbon-14, which is present in allliving tissue, radioactively decays via a first-order process. Aone-gram sample of wood taken from a living tree gives a rate forcarbon-14 decay of 13.6 counts per.
Mg + 2HCl -> MgCl2 + H2What volume of hydrogen is produced from the reaction of 50.0g of Mg and the equivalent of 75 g of HCl?
The dream of the materials chemist, is to discover a material that would be superconducting above room temperature, so that no refrigerant would be required.
The speed of a certain electrom is 995 km s-1. If the uncertainty in its momentum is to be reduced to 0.0010 per cent, what uncertainty in its location must be tolerated?
The work function of metallic rubidium is 2.09 eV. Calculate the kinetic energy and the speed of the electrons ejected by light of wavelength (a) 650 nm, (b) 195nm.
A student heats a 2.8594 gram sample of mixture that containsan unknown amount of Potassium ChlORATE (KClO3) in atest tube in the presence of some MnO2 catalyst.
From an asa stock solution of 0.0169M six diluted solutions weremade to these percentages: 0.4%, 1%, 2%, 4%, 6% and 10% what were the concentration levels in M of these solutions?
Acetaldehydedecomposes at 750 K: CH3CHO → CO + CH4.The reaction is first order in acetaldehyde and the half-life ofthe reaction is found to be 530 seconds. What is the rate constantfor the reac
A 550 mL sample of Oxygen gas is collected over water at atemperature of 21.0 degree Celcius and a pressure of 743 mmHgaccording to the following reaction. (Vapor pressure of water at21.0 degree Cel
When doing SN2 reaction synthesis of 1-bromobutane frombutan-1-ol, why would the crude product likely contains organicimpurities?
A student placed 18.0 g of glucose(C6H12O6) in a 100 ml volumetricflask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the calibration mark on
Calculate the mass in grams of iodine (I2) that wil react completely with 34.1 g of aluminum (Al) to form aluminum iodide (AlI3).
How much filtered 50% NaOH (in mL) should be added to 2.0liters of boiled deionized water to give an approximately 0.18 Msolution of carbonate-free NaOH (40.0 g/mol)?
35.0 mL of 0.255 M nitric acid is added to 45.0 mL of 0.328 MMg(NO3)2. What is the concentration of nitrate ion in the final solution?
Calculate the number of millimoles in 500 mg of each of the following amino acids: alanine (MW=89), leucine (131), tryptophan (204), cysteine (121), and glutamic acid (147).
A 2.90-mol of N2 occupies 75.0 L at 0.95 atm and 26 deg Celcius. What volume will be required to contain a mixture of 1.45 mol of N2 and 1.45 mol of O2 at the same pressure and temperature?
Esterification using carboxylic acid andalcohol requires an acid catalyst.In an experiment the acid form ofan ion-exchange resin is used. This resin, in the form of smallbeads, is a cross-linked pol
What are the intermolecular forces of naphthalene and benzil and why will benzil dissolve in naphthalene (use intermolecular forces to explain)?
You dissolved a small amount of your product (sodium thiosulfate crystals) in about 5 mL of distilled water in a test tube. You then added about 1 mL of 6M HCl solution and finally you heated the fi