4NH3 + 5O2 → 6H2O + 4NO

1. How many moles of H2O are produced if 8 mol of NH3 are combined with excess oxygen?
2. How many grams of H2O are produced if 1.9 mol of NH3 are combined with excess oxygen?
3. How many grams of H2O are produced if 68 grams of NH3 are combined with excess oxygen?

a. a primary source combines several different accounts of an event. b. a primary source generally benefits from having been written after an event.

explanation:

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.