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For 100 g mol of a gas mixture of 75 mol % CH4 and 25% H2, calculate the total heat of combustion of the mixture at 298 K and 101.32 kPa, assuming that combustion is complete.
limestone is decomposed by heating to quicklime and carbon dioxide. Calculate how many grams of quickline can be produced from 1.0kg of limestone
A box contains a mixture of small copper spheres and small lead spheres. The total volume of both metals is measured by the displacement of water to be 423 cubic centimeters and the total mass is 4.
Urea { (NH2)CO } is used for fertilizer supplyingnitrogen to the soil. Calculate the number of N atoms foundin 1.68 * 10^4g of urea.
what volume of a 0.500 M HCL solution is needed to completely neutralize 10.0ml of a 0.200M Ba(OH)2 solution
A gas filled balloon having a volume of 2.50L at 1.2atm and 25 degrees celsius is allowed o rise to the stratosphere where the temperature and pressure are -23 degrees celsius and 3.00x10^3 atm resp
Calculate the temperature in Kelvins of 10.2 grams of CO2, an Ideal Gas, trapped in a .0047 L container with a pressure of 300,000 Pa
A piece of gold has the shape of a cube- each of its sides measures 5.00 cm. the volume of a cube is length x width x height. if the density of gold is 10.5 g/cm^3, what is the mass in grams of the
A shiny piece of metal is beleved to be either platinum or nickel. if the price has a mass of 156.485g and a volume of 7.31 ml, calculate its density and decide which elemnt it is made of. The densi
What is the mole fraction of each component in a mixture of 12.45g of H2, 60.67g of N2 and 2.38g of NH3
Calculate the volume of all gases evolved by the complete oxidation of 0.390 of the amino acid alanine if the products are liquid water, nitrogen gas, and carbon dioxide gas; the total pressure is 1
The relative abundances of the stable isotopes of the elements are not entirely constant. For example, in some geology samples (soils and rocks) the ratio of 87Sr to 86Sr is affected by the presence
If an athlete weighs 133lb and has 15.0\% body fat by weight, how many pounds of fat does the athlete's body contain
A solution of cough syrup contains 5.00\% active ingredient by volume. If the total volume of the bottle is 34.0mL , how many milliliters of active ingredient are in the bottle? Express your answer
How many centimeters does light travel in 5.00 years (given that the velocity of light is 3.00 \times 10^{10} {\rm cm}/{\rm s})? Express your answer with the appropriate units.
The statements in the following multiple choices deal with various aspects of reaction rates
Which element has 55 neutrons, 36 electrons, 40 protons and has a mass of 95. I know its 95Mo but does it have a ion charge of +2,+4,or+6? I've tried +2 and +6 but its wrong. Help would be appreciat
A solution containing 26.50mg of an unknown protein per 29.5mL solution was found to have an osmotic pressure of 3.75torr at 13C. What is the molar mass of the protein
Calculate the osmotic pressure of a solution containing 25.9g of glycerin (C3H8O3) in 243.5mL of solution at 310K.
An aqueous solution containing 16.2g of an unknown molecular (nonelectrolyte) compound in 102.0g of water was found to have a freezing point of -2.0C.
Calculate the vapor pressure of a solution containing 25.3g of glycerin C3H8O3 in 125mL of water at 30.0C. The vapor pressure of pure water at this temperature is 31.8torr}
Calculate the vapor pressure of a solution containing 25.3g of glycerin C3H8O3 in 125mL of water at 30.0C. The vapor pressure of pure water at this temperature is 31.8torr}. Assume that glycerin is
the wavelegnth corresponding to maxium in the Plank distribution at the temperature T, and deduce the expression for the constant as a multiple of the second radiation constant
A is the sequence Na, Mg, Al, Si, and P. B is the sequence He, Ne, Ar, Kr, and Xe. Which statement below is true. The members of B are decreasing in size.
A foul smelling gas produced by the reaction of HCl with Na2S was collected, and 1.00 L sample was found to have a mass of 1.52 g at STP. What is the molecular mass of the gas. What is its likely fo