When 96 grams of water are produced how many grams of hydrogen must react according to the equation 2h2+o2 react to form 2h2o?

  The number  of grams of hydrogen  that must  react  according  to  equation   is  10.66   grams

2 H2  +  O2  =  2H2O

   calculation
find the number of  moles  of H2O reacted
that is   moles =  mass/molar mass
molar mass for water =  16 +(1 x2) = 18 g/mol

moles is therefore =  96 g/18 g/mol =  5.33  moles

by  use of mole  ratio between H2 to H20   which is  2:2   or 1:1  the   moles of H2 is  also = 5.33   moles

mass  of H2  is =  moles  x molar mass of H2 = 1 x2 = 2g/mol

=  5.33 moles x 2 g/mol   = 10.66  grams

Atomicity occurs to prevent updates of the database occurring only partially, which can cause greater problems than rejecting the whole series outright.some are monatomic, diatomic, triatomic etc because it shows the number of atoms. for example, monatomic means it contains only one atom.