The gram-formula mass of no2 is defined as the mass of
(1) one mole of no2
(2) one molecule of no2
(3) two moles of no
(4) two molecules of no

The correct answer is (1) one mole of NO2.

The gram formula mass is also known as the molar mass and is defined by the mass over one mole of a substance.

Hope this helps~

668900 atoms in total

The correct answer is "hydrogen".