Answer:
the are coefficients for the atom. the tell how many there are.
Explanation:
they tell you how many atoms there are of its type.
ex. 4 C²H³. there are 4 of the c² and h³ (couldn't find a way to use subscript so used the power signs to show.)
Data:
Arsenic Molar Mass = 74,9216 ≈ 75 u (<span>atomic mass unit)</span>
Solving:
1 mole of arsenic → 75g ------------ 6,02*10²³ molecules
..................................X -------------- 1 molecule
6,02*10²³X = 75
Answer:
Explanation:
In order to a molecule or ion have <em>resonance </em>structures (named resonance contributors) it must have a π bond.
π bonds are in double or triple bonds. Single bonds are formed by sigma bonds.
Resonance structures are alternate representations for the same molecule or ion with different structures. Every structure will have the same number of electrons, but the electrons can move from one atom to another, which can only be done between π bonds; never between sigma bonds.
In the ion [NH₄]⁺ there are only sigma bonds: the N atom is at the centre of the iona, bonded to four H atoms; each N - H bond is a sigma bond. So, this structure does not exhibit any resonance.
On the other hand, [NO₃] ⁻ has a double bond between one of the oxygen atoms and the N atom at the centre. So, ion has a π bond, which indicates that there are resonance structures.
Answer:
The first ionization energy is defined as
- Energy which is required to pull out one mole of the outermost shell's electrons in a neutral atom from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+.
- , where A is any neutral atom.
- In the periodic table, Its value decreases from top to bottom in groups and increases from left to right across a particular period.
- Helium has the largest first ionization energy.
- Francium has one of the lowest.
Answer:
- From octane:
- From ethanol:
Explanation:
Hello,
At first, for the combustion of octane, the following chemical reaction is carried out:
Thus, the produced mass of carbon dioxide is:
Now, for ethanol:
Best regards.