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Tooth enamel is mainly hydroxyapatite. If 1.150g of tooth enamel reacts with hydrochloric acid to give 1.231g of calcium chloride, what is the percentage of hydroxyapatite in the tooth enamel sample?
what volume and mass of steam at 100 degrees c and 1.00 atm would during condensation release the same amount of heat
Show how the moles of water produced is related to the concentration of one of the reactants (either acetic acid or sodium hydroxide). Describe how you would know which reagent the moles of water is related to.
Consider a reservoir with a diameter of 450 m and a depth of 10 m. (a) how many liters of 0.10 M NaF should be added to produce 1.6 ppm F? (b) how many grams of solid NaF could be used instead of the solution used in part (a)
A sample of carbon dioxide has a volume of 575 mL at 752 torr and 22°C. What is the mass of carbon dioxide in this sample
For the 3 wood preservatives noted, would acidic vs. alkaline soil or water conditions cause more (or less) leaching or dissolution of these compounds. How do these compounds actually leach out of wood into the environment?
If a reaction vessel contains 50.0 of carbon dioxide and 25.0g lithium hydroxide what mass of lithium carbonate can be produced?
What should be the normality of a sodium hydroxide solution if exactly 25.00ml are to be used to titrate 25.00of a vinegar sample containing 4.80% acetic acid
a 100.-l flask contains a mixture of methane ch4 andargon at 25 degrees celcius. the mass of argon present is 228g
What is the pH of a solution that has a formic acid (HCHO2) concentration of 0.39 and a potassium formate (KCHO2) concentration of 0.12? The Ka for formic acid is 1.7 x 10-4.
Ozone (O3) is produced in the laboratory from oxygen (O2) by means of an electric discharge. Once generated, ozone gradually decomposes into oxygen by first-order kinetics. The following data were obtained from a sample of freshly prepared ozone
With the pure solvent in the light path, the meter reading is 78; with a 0.1 M solution of a solute in the same solvent, the meter reading is 55. The light path is 0.5 cm. Calculate the absorbance, the transmittance, and the molar absorption coeff..
Which of the following has the smallest mass? a. 3.50 x 1023 molecules of I2
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