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Consider a piece of gold jewelry that weighs 9.78 g and has a volume of 0.680 cm3. The jewelry contains only gold and silver, which have densities of 19.3 g/cm3 and 10.5 g/cm3, respectively. If the total volume of the jewelry is the sum of the volumes of the gold and silver that it contains, calculate the percentage of gold (by mass) in the jewelry.
Solving this question helps the student to understand how to find the limiting reactant and how much product is produced and What mass of product may be produced?
Draw the Lewis structure of the conjugate base for the following acid: H2SO4. Remember to include charges and non-bonding electrons where necessary. Use an expanded octet on sulfur to minimize formal charges.
If a sample of barium contains 2.3 x 1023 atoms of barium, how many grams of barium are in the sample?
What mass of Fe will form when 63.0g of CO reacts with 145g of Fe2O3 according to the following equation? 3CO+Fe2O3->2Fe+3CO2.
Three sparingly soluble salts, MA, MA2, and MA3, all have Ksp = 1.5 x 10-7. Determine which of these three has the highest molar solubility in water? a) MA, b) MA2, c) MA3 ,d) They are all equally insoluble.
Write equilibrium reaction for HNO 2 and compute equilibrium concentrations of all species, compute pH , OH - , and the pOH
Give explanation for arrangements how you decide the boiling points comparison - Arrange all these compounds in order of increasing boiling points
A balloon filled with helium gas has a volume of 500 mL at pressure of 1 atm. The balloon is released and reaches an altitude of 6.5 km, where the pressure is 0.5 atm.
Octane has a density of 0.692 g/mL at 20 C . How many grams of O2 are required to burn 19.0 gal of C8H18.
How many molecules of carbon dioxide are produced when 129 molecules of acetylene (HCCH) to react in excess oxygen produce carbon dioxide and water.
After losing the electron, how many protons will Na have in its nucleus? Sodium (Na), atomic number 11, has a tendency to lose an electron in the presence of chlorine
Determine what is the longest possible wavelength of light that could ionize an atom of bismuth if the first ionization energy of bismuth is Ei1 = +70 kJ/mol.?
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