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You obtain the following six measurements for the mass of water delivered by a special calibrated volumetric pipette: 6.301 g, 6.308 g, 6.304 g, 6.308 g, 6.307 g, and 6.302 g. determine the mean and confidence interval of these measurements at a confidence level of 95%.
What mass of silver chloride can be prepared by the reaction of 130.0 mL of 0.15 M silver nitrate with 190.0 mL of 0.30 M calcium chloride?
An element has two isotopes with masses of 62.9396 u and 64.9278 u,and 30.83% of the atoms are the heavier isotope. Calculate the atomic mass of this element and give its name and symbol.
A 98 L sample of dry air cools from 138°C to -30.°C while the pressure is maintained at 2.85 atm. What is the final volume?
C6H5NH3Cl is a chloride salt with an acidic cation. If 19 g of C6H5NH3Cl is dissolved in water to make 150 mL of solution, what is the initial molarity of the cation.
What will be the likely effect of clearing forests and converting them to grasslands and crops on (a) the earth's reflectivity (albedo) and (b) the earth's average surface temperature?
The density of pure silver is 10.5 g/cm^3 at 20°C. If 4.63 g of pure silver pellets is added to a graduated cylinder containing 12.1 mL of water, to what volume level will the water in the cylinder rise.
Arrange the bases in increasing order of strengths. I) deuterated ammonia (ND3) Kb = 1.1 × 10?5 II) hydrazine (NH2NH2) Kb = 1.7 × 10?6 III) ammonia (NH3) Kb = 1.8 × 10?5
An automobile gasoline tank holds 21kg of gasoline. When the gasoline burns, 86kg of oxygen is consumed and carbon dioxide and water are produced.
C6H5OH(s) + 7O2(g) --> 6CO2(g) + 3H2O(g) A 2.000 gram sample of pure phenol, C6H5OH(s), is completely burned according to the equation above.
The density of so-called "heavy water"=1.1053 g/mL at 20 0C. determine what would be the mass of the flask when filled with heavy water?
A solution is prepared by dissolving 14.4 g ammonium sulfate in enough water to make 100.0 mL of stock solution. A 11.50 mL sample of this stock solution is added to 55.00 mL of water.
The half-life of a certain radioactive element is 1,250 years. What percent of the atoms remain after 7,500 years?
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