The following steps were carried out to determine the percentage of iron in an iron wire. a) The iron wire was weighed and the mass reading was recorded. Mass reading = 4.80 g b) The wire was reacted with excess dilute hydrochloric acid at room temperature and pressure. It was found that of hydrogen gas was given off at room temperature and pressure. What is the percentage purity of the iron wire?
Question
The following steps were carried out to determine the percentage of iron in an iron wire. a) The iron wire was weighed and the mass reading was recorded. Mass reading = 4.80 g b) The wire was reacted with excess dilute hydrochloric acid at room temperature and pressure. It was found that of hydrogen gas was given off at room temperature and pressure. What is the percentage purity of the iron wire?
Solution
It seems like there's some information missing from your question, specifically the amount of hydrogen gas that was given off during the reaction. However, I can explain how to calculate the percentage purity of the iron wire once you have that information.
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First, you need to know the balanced chemical equation for the reaction of iron with hydrochloric acid. It is: Fe + 2HCl -> FeCl2 + H2. From this equation, you can see that 1 mole of iron reacts to produce 1 mole of hydrogen gas.
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Use the ideal gas law to calculate the number of moles of hydrogen gas produced. The ideal gas law is PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. If the pressure and temperature are at standard conditions (1 atm and 273 K), and you know the volume of hydrogen gas produced, you can solve for n.
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The number of moles of hydrogen gas produced is equal to the number of moles of iron in the wire, according to the balanced chemical equation.
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Calculate the number of grams of iron that this number of moles corresponds to, using the molar mass of iron (55.85 g/mol).
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The percentage purity of the iron wire is then (mass of iron / mass of wire) * 100%.
Once you have the missing information, you can use these steps to calculate the percentage purity of the iron wire.
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