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When 12.1461 g of calcium metal is reacted with 8.3259 g of water, 4.3728 g of calcium hydroxide was produced as well as some hydrogen gas. What is the theoretical yield of calcium hydroxide? What is the percent yield?
Explain why one mole of oxygen molecules exerts the exact same pressure on the walls of a vessel as one mole of hydrogen molecule even though the mass of the oxygen molecule is 16 times greater than that of the hydrogen gas molecule.
The accompanying photo shows a pipevine swallowtail caterpillar climbing up a twig. As the caterpillar climbs, its potential energy is increasing. What source of energy has been used to effect this change in potential energy?
a sample of helium gas initially at 37 degrees celsius, 785 torr and 2.00L was heated to 58.0 degrees celcius while the volume expanded to 3.24L. What is the final pressure in atm.
A certain minimum energy(E min) is required to eject an electron from a photosensitive surface. Any energy obsorbed beyond this minimum gives kinetic energy to the ejected electron.
An oxalic acid solution contains the subsequent species in varying concentrations- C2H2O4,C2HO-4,C2O2-4, and H+. Depict Lewis structures of C2HO-4, and C2O2-4. Which of the above four species can act merely as acids which can act only as bases, ad..
a biological cell is immersed in a 60. mm solution of nacl at37degc. the cells membrane is permeable only to naions.
A 2.88 g lead weight, initially at 10.6 C, is submerged in 7.68 g of water at 52.0 C in an insulated container. What is the final temperature of both substances at thermal equilibrium
Calculate the equilibrium constant for the reduction of bismuth from the Bi(III) tetrachloro ion to the elemental metal.
A typical automobile gets 30 miles per gallon of gas and drives 12,000 miles every year. Assuming that octane (C8H18, density 0.7025 g cm-3) is a principal component of gasoline
An experiment shows that a 248 -mL gas sample has a mass of 0.433 g at a pressure of 749 mmHg and a temperature of 29*C. What is the molar mass of the gas
A freeway has 10,000 vehicles per hour passing a house 200 m away. Each car emits an average of 1.5 g/mi of NOx, and winds are blowing at 2 m/s across the freeway towards the house.
shown to contain 12.518 g silver, 0.6970 g carbon, and 2.786 g oxygen. What is the empirical formula of the sample?
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