How many atoms are in HCOOH₂?

The chemical bond connecting one nucleotide with the next one along the nucleic acid chain is called a

Butane gas reacts with oxygen gas to give carbon dioxide gas and water vapor (gas). if you mix butane and oxygen in the correct stoichiometric ratio, and if the total pressure of the mixture is 390 mmhg, what is the pressure (in mmhg) of water vapor after the reaction is completed (temperature and volume do not change).

Mr. rose asked his student to draw a quadrilateral with four unequal sides. an example of this kind of quadrilateral