Question

5. Number of grams of oxygen in 32.2 g 2 4 2 Na SO H O .10 is a) 20.8 b) 22.4 c) 2.24 d) 2.08

Answer 1

Answer : plz mark as brainliest

Explanation:No. of oxygen atoms in one molecule =4+10=14

Thus moles of oxygen in n moles of compound=n*14

Molar mass of Na2SO4.10H2O=46+32+64+180=322g/mol

Thus

32.2g=32.2/322=0.1 mols  

Thus moles of O=0.1*14=1.4

So weight is  

16*1.4=22.4g