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Ch.10 - Gases: Their Properties & Behavior
McMurry - Chemistry 8th Edition
McMurry8th EditionChemistryISBN: 9781292336145당신이 사용하는 게 아니라요?교과서 변경
모든 교과서McMurry 8th EditionCh.10 - Gases: Their Properties & Behavior문제 72b
10장, 문제 72b

Hydrogen gas can be prepared by reaction of zinc metal with aqueous HCl: Zn(s) + 2 HCl(aq) ¡ ZnCl2(aq) + H2(g) (b) How many grams of zinc would you start with if you wanted to prepare 5.00 L of H2 at 350 mm Hg and 30.0 °C?

검증된 단계별 안내
1
Convert the pressure from mm Hg to atm using the conversion factor: 1 atm = 760 mm Hg.
Convert the temperature from Celsius to Kelvin by adding 273.15 to the Celsius temperature.
Use the ideal gas law, PV = nRT, to solve for the number of moles of hydrogen gas (n). Use R = 0.0821 L·atm/mol·K.
Use the stoichiometry of the balanced chemical equation to find the moles of zinc needed. According to the equation, 1 mole of Zn produces 1 mole of H2.
Convert the moles of zinc to grams using the molar mass of zinc (65.38 g/mol).

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주요 개념

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Stoichiometry

Stoichiometry is the calculation of reactants and products in chemical reactions. It involves using balanced chemical equations to determine the proportions of substances involved. In this case, the stoichiometric coefficients from the reaction equation indicate that one mole of zinc produces one mole of hydrogen gas, which is essential for calculating the amount of zinc needed.
추천 영상:
가이드 코스
01:16
Stoichiometry Concept

Ideal Gas Law

The Ideal Gas Law relates the pressure, volume, temperature, and number of moles of a gas through the equation PV = nRT. This law allows us to calculate the number of moles of hydrogen gas produced under specific conditions of pressure and temperature. By rearranging the equation, we can find the moles of H2 needed to determine the corresponding mass of zinc required for the reaction.
추천 영상:
가이드 코스
01:15
Ideal Gas Law Formula

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). For zinc, the molar mass is approximately 65.38 g/mol. Knowing the molar mass is crucial for converting between moles of zinc and grams, allowing us to calculate how much zinc is necessary to produce the desired volume of hydrogen gas.
추천 영상:
가이드 코스
02:11
Molar Mass Concept
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