<u>Ans: O2 because it produces only 0.20 mol of NO</u>
<u>Given:</u>
Mass of NH3 = 4.0 g
Mass of O2 = 8.0 g
<u>To determine:</u>
The limiting reagent in the given reaction
4NH3 + 5O2 → 4NO + 6H2O
<u>Explanation:</u>
# moles of NH3 = 4.0/17 g.mol-1 = 0.2353 moles
# moles of O2 = 8.0/32 = 0.25 moles
Based on the reaction stoichiometry:
1 mole of NH3 produces 1 mole of NO
Therefore, 0.2353 moles of NH3 will produce: 0.2353 moles of NO
Similarly, 1 mole of O2 will produce 4/5 moles of NO
0.25 moles of O2 will form: 0.25*4/5 = 0.2 moles of NO
Thus, O2 is the limiting reactant.
CH₄(g) + 3 Cl₂(g) → CHCl₃(g) + 3 HCl(g)
From the equation we notice that 1 mole of methane produces 1 mole of chloroform:
16 g Methane → 119.38 g Chloroform
? g Methane → 37.5 g Chloroform
by cross multiplication:
= (16 * 37.5) / 119.38 = 5.0 g methane
It is +5. There -8 charge due to four oxygen atoms and +3 due to one sodium atom and 2 hydrogen atom which makes it necessary for phosphorus to have +5 charge on it to make the compound electrically neutral. The charge on phosphorus corresponds to its oxidation number.
Answer:
Maybe try to memorize it by the valence electrons. You can do this!!
The correct option is C.
An atom can be either in the ground state or in an excited state. An atom is said to be in the ground state, if the total energy of its electron can not be lowered by moving one or more electrons into different orbitals. At the ground state, the electrons in the atom have the lowest energy possible and they are stable. On the other hand, an atom is said to be in an excited state, if the energy of its electrons can be lowered by transferring one or more electrons into different orbitals. An atom in an excited state has more energy and is less stable.
