Answer:
8 grams
Explanation:
- Finding the mr of each part:
[tex]Na_{2}[/tex] = 23 x 2 = 46
[tex]SO_{4}[/tex] = 32.1 + (16 x 4) = 96.1
- Finding the fraction of the compound that is Na+
[tex]\frac{46}{96.1 + 46} = \frac{460}{1421}[/tex]
- We now know that per gram, 460/1421g are Na+
In 25g, [tex]\frac{460}{1421} * 25 = 8.09289.... = 8g[/tex]
So there are 8g Na+
Hope this helps, let me know if you have any questions! :)
