An element is a pure substance that consists entirely of one pure substance. Compounds are a substance that is formed by two or more elements. Elements are composed of the same atomic atoms/molecules. This means that every particle in an element has the same number of protons in the nucleus.
Water is not alive because it has no living organisms.
CO2 + 4 H2=CH4 + 2 H2O
The ratio between CO2 and CH4 is 1 : 1
Moles CH4+25.1
The ratio between H2 and H2O is 4 : 2
Moles H2= 19.1 x 4/2= 38.2
This has multiple answers can you be more specific