What is the ratio of mass of hydrogen and oxygen in water?

1:8

Explanation: The ratio of hydrogen and oxygen by mass in water is 1:8. The atomic masses of H and O are 1 g/mol and 16 g/mol respectively.

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be