a crystal is known as tiny grains in alloys of aluminum and manganese. To analyz
ID: 483281 • Letter: A
Question
a crystal is known as tiny grains in alloys of aluminum and manganese. To analyze the exact composition of the grains 1,0000g of the sample was dissolved in hydrochloric acid, and measured volume of hydrogen. Mols (n) of this hydrogen is 4.623 * 10^-5 . What is mole fraction (X) of manganese content in a sample of that crystal? a crystal is known as tiny grains in alloys of aluminum and manganese. To analyze the exact composition of the grains 1,0000g of the sample was dissolved in hydrochloric acid, and measured volume of hydrogen. Mols (n) of this hydrogen is 4.623 * 10^-5 . What is mole fraction (X) of manganese content in a sample of that crystal?Explanation / Answer
The balanced reaction of Al is ,
AL + 3 HCl = ALCl3 + 1.5 H2
Similarly, the balanced reaction of Mg is
,Mn(s) + 2 HCl(aq) = MnCl2(aq) + H2(g)
So, the ratios of H2 gas of Al and Mn will be 1.5:1 = 3:2
Now, Total moles of H2 = 4.623 * 10^-5
Moles of H2 due to Al = (3/5) x 4.623 * 10^-5 = 2.7738 * 10^-5 = moles of Al
Moles of H2 due to Mn = (2/5) x 4.623 * 10^-5 = 1.8492 * 10^-5 = moles of Mn
Mole fraction of Mn = 1.8492 * 10^-5 / ( 4.623 * 10^-5) = 0.4