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Potassium crystallizes in a body-centered cubic lattice. The radius of a potassium atom is 235 pm. Determine the density of potassium in g/cm3.
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A sample of a substance (containing only C, H, and N) is burned in oxygen. 8.696 g of CO 2 , 2.225 g of H 2 O and 4.446 g of NO are the sole products of combustion. What is the empirical formula of the compou ...
Hydrogen peroxide was catalytically decomoposed and 75.3 mL ofoxygen gas was collected over water at 25 degrees celsius and 742torr. What mass of oxygen was collected? (Pwater =24 torr at 25 degrees celsius)
2 moles of a compound are allowed to react ina foam coffee cup that contains 197 grams of water. The reaction caused the temperature of the water to rise from 21 to24.7 degrees Celsius. What is the enthalpy of this react ...
While heating your copper sulfur mixture the original crucible lid fell and was broken. You replace the lid with another one. You used the mass of the original lid in your calculations. However the mass of the second lid ...
Assume that you dissolve 10.2 g of a mixture of NaOH and Ba(OH)2 in 227.0 mL of water and titrate with 1.47M hydrochloric acid. The titration is complete when 107.8 mL of the acid has been added. What is the mass (in gra ...
A 479 mL sample of 0.9833 M HCl is mixed with 485 mL sample of NaOH (which has a pH of 13.48). What is the pH of the resulting solution?
How much will the temperature change when 3.0 g of tooth enamel (specific heat = 0.18 cal/g C) absorbs 0.80 cal of heat energy?
Name five types of radiation. Describe, in table form, their mass number, charge, and identity.
A solution has a concentration of 10.0 m and contains 5.0 g NH3. What is the volume (in milliliters) of this solution
How many moles of magnesium ion are present in 5.25g Mg 3 (PO 4 ) 2 ?
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