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Three balloons filled with three different gaseous compounds each have a volume of 22.4 L at STP. Would these balloons have the same mass or contain the same number of molecules? Explain.
What is the net redox reaction that occurs when Pt comes into contact with acidic KMnO4
How many millimeters of 0.0700 M EDTA are required to react with 50.0 mL of 0.0140 M Cu2+?, b) With 50.0 mL of 0.0140 M Sc3+?
how many molecules of ethanol ch2h5oh the alcohol in alcoholic beverages are present in 145ml of ethanol? the density
The mole fraction of oxygen molecules in dry air is 0.2095. What volume of dry air at 1.00 atm and 25°C is required for burning 1.00 L of hexane (C6H14, density = 0.660 g/mL) completely, yielding carbon dioxide and water
You need to dissolve CaCl2 in water to make a mixture that is 38.0% calcium chloride by mass. If the total mass of the mixture is 681.2 g, what masses of CaCl2 and water should be used
KCl has the same crystal structure as NaCl. Calculate the volume of the unit cell, given that ionic radii are K+ = 152 pm and Cl- = 167 pm. Compare the density of KCl. Which has the larger unit cell, NaCl or KCl?
When the sample burned, the products were CO2 gas and H2O vapor. The CO2 was collected and its pressure found to be 25.2kPa in the same volume and at the same temperature as the original mixture. What % of original mixture was methane
What mass of Na2S2O3 is required to prepare 1.00 L of a solution that will dissolve 1.00 g of AgBr by the formation of Ag(S2O3)2^3-? Show work.
molybdenum forms a substitutional solid solution with tungsten. calculate the concentration in weight percent of
A container holds 355mL of a mixture of nitrogen and carbon dioxide gases. Compute the partial pressures of each gas if the container is at 27.3 degrees C.
what is the volume of a sample of helium that has a mass of 6.36 times 10-3 g and a density of 0.17847 gl? answer in
The following reaction is second order in (A) and the rate constant is 0.039 M-1 s-1. The concentration of A was 0.30 M at 23 s. The initial concentration of A was
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