Gaseous methane (CH4) will react with gaseous oxygen (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O). Suppose 13. g of methane is mixed with 24.1 g of oxygen. Calculate the minimum mass of methane that could be leftover by the chemical reaction. Round your answer to 2 significant digits.
QUESTION#1:
TOPIC: Limiting reactants
Gaseous methane (CH4) will react with gaseous oxygen (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O). Suppose 13. g of methane is mixed with 24.1 g of oxygen. Calculate the minimum mass of methane that could be leftover by the
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QUESTION #2:
TOPIC: Solving for a reactant in solution
One way the U.S. Environmental Protection Agency (EPA) tests for chloride contaminants in the water is by titrating a sample of silver nitrate solution. Any chloride anions in the solution will combine with the silver cations to produce a bright white silver chloride precipitate. Suppose an EPA chemist tests a 250. mL sample of groundwater known to be contaminated with nickel(II) chloride, which would react with silver nitrate solution like this:
The chemist adds 34.0 mM silver nitrate solution to the sample until silver chloride stops forming. He then washes, dries, and weighs the precipitate. He finds he has collected 8.9 mg of silver chloride. Calculate the concentration of nickel(II) chloride contaminant in the original groundwater sample. Round your answer to 2 significant digits.
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? mg/L
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