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A penny is composed of zinc (97.5%), plated with copper (2.5%), and weighs 2.500g. Hydrochloric acid reacts with zinc but not with copper to form hydrogen gas (H2) and zinc chloride (ZnCl2). A penny with a scored edge allows the HCl to react with the internal zinc metal, leaving a shell of unreacted copper. How many moles of hydrogen gas are formed by reacting a penny with excess HCl?
The half-life of tritium (31H) is 12.3 years. If 47.0 mg of tritium is released from a nuclear power plant during the course of a mishap, what mass of the nuclide will remain after 24.6 years?What mass of the nuclide will remain after 98.4 years?
how much heat does your body lose when 2.95g of sweat evaporates from your skin at 25 degrees Cecilius
suppose .853L of H2 is collected at 15 degrees celcius and 782 mmHg. how much electricity in coulombs must have passed through the solution
A copper refinery produces a copper ingot weighing 75 kg. the density of the copper is 8.94 g/cm^3. if the copper is drawn into a wire whose dimeter is 8.250mm
A piece of galena has a volume of 5.4 cm3. If the density of galena is 7.5 g/cm3, what is the mass (in kg) of that piece of galena?
calculate the mass in kilograms of 3.99 liters of acetic acid. the density of this substance is 1.05g/mL ?
what is a good conductor at high temperature and a poor conductor at low temperature? YBa2Cu3O7 GaAs S Cu
calculate the mass in grams of NaCl Present in each of the following solution A. 11.5 g Of 6.25 % NaCl Solution B. 6.25 g of 11.5 % NaCl solution
A 4.867 g sample of a monoprotic acid was dissolved in water. It took 30.24 mL of a 0.1578 M NaOH solution to neutralize the acid. Calculate the molar mass of the acid.
A 2.154 g sample of HgO produces 125 mL of oxygen gas. The gas is collected over water at 24 C and an atmospheric pressure of 763 torr.
If hydrogen gas is collected over water at 20°C and 763 mm Hg, what is the partial pressure of the H2? The vapor pressure of water at 20°C is 17.5 mm Hg.
What is the pH of a solution containing 0.001 M NaHCO3 and 0.002 M NH3? You may assume that both the carbonic acid system
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