Now if z is the initial mass of magnesium and y is the initial mass of aluminum, the total number of moles of hydrogen gas produced, n, can be expressed as n= 0.0411z +0.0556y. If the total mass of the two metals is 0.250 g, then z+y=0.250, and therefore I= 0.250 – y. Substitute for I in the first equation to express n in terms of y n=0.0411(0.250 – y) +0.0556y The value of n can be found using the ideal gas law. Part C Taking into account the vapour pressure of water, how many moles of hydrogen gas, n, are present in 303 mL at 752 Torr and 29 °C? The value of the gas constant Ris 0.08314 L bar mol-1 K-1 You may also find the conversion factors1 bar = 750 Torr and Tx = Tc + 273 useful. Express the number of moles to three significant figures. • View Available Hint(s) n= 1,16x10-2 mol Submit Previous Answers v Correct Part D What is the mass percentage of aluminum in this alloy? Express your answer numerically. > View Available Hint(s) Iνα ΑΣφ %

Now if z is the initial mass of magnesium and y is the initial mass of aluminum, the total number of moles of hydrogen gas produced, n, can be expressed as n= 0.0411z +0.0556y. If the total mass of the two metals is 0.250 g, then z+y=0.250, and therefore I= 0.250 – y. Substitute for I in the first equation to express n in terms of y n=0.0411(0.250 – y) +0.0556y The value of n can be found using the ideal gas law. Part C Taking into account the vapour pressure of water, how many moles of hydrogen gas, n, are present in 303 mL at 752 Torr and 29 °C? The value of the gas constant Ris 0.08314 L bar mol-1 K-1 You may also find the conversion factors1 bar = 750 Torr and Tx = Tc + 273 useful. Express the number of moles to three significant figures. • View Available Hint(s) n= 1,16x10-2 mol Submit Previous Answers v Correct Part D What is the mass percentage of aluminum in this alloy? Express your answer numerically. > View Available Hint(s) Iνα ΑΣφ %

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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