What will be the mass of Magnesium using the values and the formula above? ( sol

Question

What will be the mass of Magnesium using the values and the formula above? ( solution highly appreciated) Percent Magnesium in a Mixture Background In this experiment you will determine the percent magnesium in a mixture containing only magne- sium and zinc by reacting the sample with hydrochloric acid and measuring the volume of hydrogen gas evolved. The reactions are: Mg(s) +2 HCI(aq)- MgCl2 (aq) + H2 (g) ng 2 HCla) ZnCl (ag)+ H2 (e) EXP. NUMBER EXPERIMENT/SUBJECT DATE NAME LAB PARTNER LOCKER/DESK NO COL nleuown number mass of com par ometrc pressure jog 0.0164 2.6 mL bar rahwre 2'4'C Mass o Mg (x

Explanation / Answer

From the reactions one mole of Mg gives 1 moles of H2 gas

And 1 mole of Zn gives 1mole of H2 gas

Therefore

Moles of H2 = MOles of Mg + Zn

Mass of mixture = 0.0769 gm

Mass of Mg = x

Mass of Zn = 0.0769-x

Moles of Mg = x / 24

Moles of Zn = 0.0769-x / 65.38

2.01 *10^-3= x /24 + 0.0769-x / 65.38

x = 0.0316 gms

Mass of Mg = 0.0316 gms

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