What is the molar mass of hydrogen? ?

The relative atomic mass of hydrogen is 1.007.

MOLAR MASS OF AN ELEMENT = RELATIVE ATOMIC MASS * MOLAR MASS CONSTANT(1g/mol)

for HYDROGEN,

MOLAR MASS of Hydrogen = 1.007*1g/mol

MOLAR MASS of Hydrogen= 1.007 g/mol

For H2: 1.007 x 2 = 2.014 grams per mole

a chemical reaction happens

explanation:

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.