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Modern pennies are composed of zinc coated with copper. Student finds the mass of a penny to be 2.482 g and then makes several scratches in the copper coating (to expose the underlying zinc). The student puts the scratched penny in hydrochloric acid, where the subsequent reaction happens between the HCl and zinc (the copper remains undissolved):
Zn(s) + 2HCl(aq) --> H2(g) + ZnCl2(aq)
The student collects the hydrogen produced over water at 25 degrees Celsius. The collected gas occupies a volume of 0.899 Lat a total pressure of 791 mmHg. (Suppose that all theZn in the penny dissolves.)
What equation is used to find the amount of H2 gas provided the information from the question?
The pH of 0.5 M HF is 1.88. Calculate the difference in pH when 6.06 g of NaF is added to 205.7 mL of this solution. Ignore any changes in volume. The Ka value for HF is 3.5 x 10-4.
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a 0.21 m3 drum contains 100 l of a mixture of several degreasing solvents in water. the concentration of
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If the measured gas pressure in a collection flask during a gas-forming reaction was determined to be 1.44 atm, and the atmospheric pressure that day was measured as 0.95 atm.
A reaction has ?G = 10.0 kJ and ?G° = 15.0 kJ at a temperature of 50 °C. Calculate the value of the reaction quotient Q under these conditions.
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