The formula of water, H2O suggests which of the following?

A. there are two hydrogen atoms and one oxygen atom per water molecule.
B. there are two oxygen atoms and one hydrogen atom per water molecule.
C. there is twice as much mass of hydrogen as oxygen in each molecule.
D. there is twice as much mass of oxygen as hydrogen in each molecule.
E. None of these choices are correct.

A. There are two hydrogen atoms and one oxygen atom per water molecule.

Explanation:

The chemical formular for water "H2O", means it contain 2 hydrogen atoms and one oxygen atom per molecule.

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.