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A calcium carbonate tablet dissolves with stomach acid which contains hydrochloric acid. CaCO3 (s) + HCl (aq) -------- CaCl2 (aq) + H2O (l) + CO2 (g)
How many calcium carbonate tablets each containing 500mg of the active ingredient are required to react with 4. g of stomach acid containing 37.5 % HCL by mass?
A solution of 5.36 g of a molecular compound dissolved in 76.8 g benzene (C6H6) and has a boiling point of 81.46oC. What is the molar mass of the compound
a 1.750 g sample containing potassium hydrogen carbonate is decomposed by heating. if the mass loss is .271g, what is the percentage of KHCO3 in the unknown mixture
Acetylene (C2H2) and hydrogen fluoride (HF) react to give difluoroethane: C2H2(g) + 2HF(g) = C2H4F2(g) When 4.4 mol of C2H2 and 22 mol HF are reacted in a 12.8 L flask, what will be the pressure in the flask at 7.9°C when the reaction is complete
An iron ore was found to contain 92.0% pyrite (fool's gold). Pyrite has the formula FeS2and is 46.5% iron. How many grams of iron are there in 65.8 grams of iron ore
Use the standard enthalpy change of formation data to calculate the standard enthalpy change of combustion of C5H12O.
If you take a 67.5 mL portion of 1.98 M. NH3 stock solution and dilute it to a total volume of 0.600 L, what will the concentration of the final solution be?
Compare the primary, secondary, and tertiary structures of a protein with the structure of a telephone
if we have a solution that contains 0.022 m calcium and 0.014 magnesium and we have to use potassium hydroxide to
If 2.50 g CuSO4 are dissolved in 8.0 x 102 mL of 0.25 M NH3, what are the concentrations of Cu2+, Cu(NH3)42+, and NH3 at equilibrium
Suppose that a refrigerator cools to -4 degrees C, discharges heat at 20 degrees C and operates with 50% efficiency.
A weather balloon has a volume of 450 L when filled with helium at 45oC to a pressure 0.80 atm. What is the new volume of the balloon in an atmosphere where the pressure
The specific heat capacity of silver is 0.24 J/°C · g. Calculate the energy required to raise the temperature of 120.0 g Ag from 273 K to 305 K
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