Question

Calculate the mass in gram of Na+ in 25g of Na2SO4

Answer 1

8 grams

Step-by-step explanation:

• Finding the mr of each part:

`Na_(2)` = 23 x 2 = 46

`SO_(4)` = 32.1 + (16 x 4) = 96.1

• Finding the fraction of the compound that is Na+

`(46)/(96.1 + 46) = (460)/(1421)`

• We now know that per gram, 460/1421g are Na+

In 25g,
`(460)/(1421) * 25 = 8.09289.... = 8g`

So there are 8g Na+

Hope this helps, let me know if you have any questions! :)