Question

Average atomic mass of magnesium is 24.31 amu the magnesium is composed of 79% of 24 mg and remaining 21 percent of 25 mb and 26 mg calculate 26 mg %

Answer 1

Answer:

Explanation:

Let the moles of magnesium to be x .

So, the moles of 21% will be (21-x).

Now, to calculate the average atomic mass of magnesium we have to let the total mass to be as 100 and hence the average of all these will be equal to 24.31AMU .

To calculate average atomic mass for finding x:-

{79*24 + 26*x + (21-x)25}/100 = 24.31

1896 + 26x + 525 -25x = 2431

x = 10 .

Hence, the mole of magnesium is 10.