What is the importance of conservation of mass, in the real world?

In saturated organic compounds, all the bonds between carbon atoms are called?

What term describes technology that operates on an atomic level

When a chemist collects hydrogen gas over water, she ends up with a mixture of hydrogen and water vapor in her collecting bottle if the pressure in the collecting bottle is 97.1 kilopascals and the vapor pressure of the water is 3 2 kilopascals, what is the partial pressure of the hydrogen?