Nitrogen and hydrogen combine together to form ammonia.

N₂ + 3H₂→ 2NH₃

[Relative atomic masses of N = 14 u, H = 1 u]

The mass of nitrogen and hydrogen which combine together to form 6.8 g ammonia is

In a chemical reaction 10.6 g of sodium carbonate reacted with 12g of ethanoic acid. The products were 4.4 g carbon dioxide, 1.8 g of water and sodium ethanoate. The mass of sodium ethanoate formed is

During an experiment hydrogen (H₂) and oxygen (O₂) gases reacted in an electric are to produce water as

follows: 2H + O₂ 2H₂O

The experiment is repeated three times and data tabulated as shown below:

During 3^rd experiment the researcher forgot to list masses of H₂ and O₂ used. So, if the law of constant proportion is correct then find mass of O₂ used during 3^rd experiment.

Which of the following correctly represent 360 g of water?

I. 2 moles of H₂O

II. 20 moles of water

III. 6.022 × 10²³ molecules of water

IV. 1.2044 × 10²⁵ molecules of water

3.42 g of glucose are dissolved in 18 g of water in a beaker. The number of oxygen atoms in the solution is