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White phosphorous, P4, is prepared by fusing calcium phosphate, Ca3 (PO4 )2 , with carbon, C, and sand, SiO2, in an electric furnace. 2Ca3(PO4)2 (s) + 6 SiO2(s) + 10C (s) ---->
A commercial stomach acid neutralizer consists mainly of Mg (OH)2. Determine the number of grams of Mg (OH)2 would be needed to neutralize the daily output of gastric juice, which is about 2
Helens in 1980, gas samples from the volcano were taken by sampling the downwind gas plume after the large eruption of Mount St. The unfiltered gas samples were passed over a gold-coated wire coil t
Discuss the molarity of a barium chloride solution prepared by dissolving 9.9 grams of BaCl2•2(H2O) in enough water to make 334.0 mL of solution?
Explain what solvent would you use to calculate the density of cadmium nitrate? And convert your densities to kg/L and compare these values with those in g/mL.
Compare velocity of the raindrop to this velocity. Describe why the raindrop, which has the far greater velocity than bullet, does not harm us.
What error would result in the volume dimension and what would be the effect of this error on the designed density when the air bubbles were trapped in your solid beneath the liquid level in your d
The unknown was found to have a boiling point of 57C at 658 mm Hg. A liquid unknown was found to be in soluble in water and soluble in alcohol and cyclohexane; determine the substance?
Calculate the percentages of 35Cl and 37Cl in naturally occurring chlorine when the average atomic mass of chlorine is 35.453 amu.
The pure optically active substance Z has a specific rotation of 1500. Determine the % optical purity (enantiomeric excess) of Z and what % Z and Z' does the sample contain?
Determine the specific rotation of an unknown if at a concentration of 2.00/10.0 ml. the observed rotation is.500 , using a 1.00 cm cell.
After three days sample of radon-222 has decayed to 58% of its original amount. How long will it take sample to decay to 30% of its original amount?
Suppose you have a sample of a pure glyceraldehydes of the specific rotation [α] = -8.70. Can you determine from this experimental fact alone, and without consulting the literature, if this is
Determine the heat evolved in freezing water at -10.°C, given that ΔH = -6004 J/mol at 273K for H2O(l) → H2O(s) and that CP,m(l) = 75.3 J/K⋅mol and CP,m(s) = 36.8J/K⋅mol.
The town had the population of 60,000 in 2000 and 70,000 in 2010. Determine the exponential function which will forecast the populations as the function of number of years since 2000.
Solve given quadratic equation exactly using quadratic formula. Write solutions in simplest form. Using the calculator, find all irrational solutions to nearest thousandth.
The rectangular field is to be subdivided in ten equal fields. There is 5050 feet of fencing available. Determine dimensions of field which maximizes total area.
Population of the certain species of fish has the relative growth rate of 1.6% per year. It is evaluated that population in 2000 was 11 million. Evaluate fish population in year 2005.
Half-life of radium-226 is 1600 years. Assume we have 27-mg sample. After how long will only 19 mg of sample remain?
3 forces with magnitudes of 210 newtons, 145 newtons, and 23 newtons act on the object at angles of 90 degrees, 225 degrees, and 55 degrees, respectively. Determine direction and magnitude of result
Use the grapher to sketch graph of function from part (a) incorporating restrictions from part b. d. use the grapher to find value of x for which volume is the maximum. also determine maximum volume
Write an equation of the polynomial function p having only roots -4,-2,1, and 3 and with given characteristics. There are several possible solutions.
Find tallest 9-foot wide truck which can pass through arch? Provide height accurate to two decimal places and find widest 16-foot high truck which can pass through arch?
The open rectangular box (no top) with volume six cubic meters has the square base. State surface area of box as the function of length of one of the sides.