Question

how many (a) molecules (b)hydrogen atoms (c) oxygen atoms are there in 0.5 mole of water

plz answer

please....

Answer 1

as we know that the water chemical formula is H2O
​so water contains 2 atoms of hydrogen
​therefore molar mass  of hydrogen in water = 2 g
so it means that it has 2 mole of water.
​ 
therefore 0.5 mole of hydrogen in water = 1g
​now as same 
 number of atoms of oxygen in hydrogen =1

 so molar mass= 16 g
​so 0.5 mole of  oxygen contains = 8 g

​so 0.5 mole of  water contains = 1g + 8g
                                                 = 9g
​therefore it contains
1 atom of hydrogen and 1/2 atom of oxygen
​