Unlocking the Power of Chemistry: Calculating Zinc Mass Added

Is it possible to calculate how many grams of zinc was added to a stoppered flask containing excess HCl by measuring the change in pressure of the flask when all zinc has been reacted?

True / False

Answer:

True

It is indeed possible to calculate the mass of zinc added to a stoppered flask containing excess HCl by measuring the change in pressure of the flask when all zinc has been reacted. This process involves utilizing the principles of chemistry and the ideal gas law equation to determine the mass of zinc added.

To calculate the mass of zinc added to the stoppered flask, we need to consider the reaction between zinc and excess hydrochloric acid (HCl). The reaction between zinc and HCl produces hydrogen gas, which results in a change in pressure within the flask.

By measuring the change in pressure and applying the ideal gas law equation (PV = nRT), we can determine the change in the number of moles of gas involved in the reaction. This change in moles of gas allows us to establish the amount of zinc that reacted with the HCl.

Furthermore, utilizing the balanced chemical equation for the reaction, we can establish the mole ratio between zinc and hydrogen gas. This information enables us to calculate the moles of zinc that were consumed during the reaction.

Finally, by knowing the molar mass of zinc (65.38 g/mol), we can convert the moles of zinc to grams and determine the mass of zinc added to the flask. This method provides a precise and scientific approach to calculating the mass of zinc based on the change in pressure.

By understanding and applying these chemical principles, we can unravel the mysteries of reactions and determine the mass of substances involved in a reaction. Chemistry offers a fascinating journey into the world of matter and energy, where calculations can unlock the secrets of the elements.