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Suppose that a series of measurements have shown that the mean mass of an object 201.3g with a standard deviation 1.3g How many significant figures are justified in the mean and how would you report the most probable mass of the object. Explain
The density of diamond is 3.51 g/cm . The international (but non-SI) unit for weighing diamonds is the "carat" (1 carat = 200 mg exactly.) What is volume of a 0.66 carat diamond?
A solution contains either cr^3+ or Ni^2+ ion. describe a reaction with a single reagent that will identify which ion is present
A solution was prepared by mixing 70ml of 4.00 mol/L HCl and 30.0 mL of 8.00 mol/L HNO3. Water was then added until the final volume was 500ml. What is the [H+] and what is the pH ?
Given the following activation energies, what is the rate constatnt for a catalyzed and uncatalyzed decomposition of hydrogen peroxide(H2O2). Ea(uncatalyzed) 76kJ/mol, Ea(catalyzed) 19JkJ/mol
What percentage of the Sr-90 that was formed in the detonation of the first fission bombs in August 1945 is still present in the environment in August 2032?
boron has two naturally occurring isotopes 10b 19.9and 11b 80.1. although the b2 moleculedoes not exist naturally on
The observed rotation of a solution of 1.2 g of a compound in 10 mL of water is -6.9 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound
A 325-mL sample of solution contains 25.3 g of CaCl2, which is fully dissolved. (a) Calculate the molar concentration of Cl- in this solution. (b) How many grams of Cl- are in 0.100 L of this solution?
What is the entropy of the combustion above?
Determine how many grams are in 1 mole of salt. How many individual ionic compounds of NaCl are in 1 mole
A sample of gas is collected over water at a temperature of 35.0C when the barometric pressure reading is 763 torr. What is the partial pressure of the dry gas, given PH2O =42.2 torr?
The concentrations of NaCl and KI are at 0.100 M and 0.090 M, respectively, in the following electrochemical cell:You'll need to use the Nernst equation to solve this problem
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