You must remember that oxidation number of hydrogen in acids is always +1, oxidation number of oxygen in oxides & acids is always -2... metals has always oxidation number on plus!
group NO3 comes from HNO3...and oxidation number of whole acid group is always on minus and equal to the amount of hydrogen atoms in this acid... so oxidation number of NO3 = -1
we have 2 NO3 groups so 2*(-1) = -2 and that is the reason why oxidation number of Fe in this formula must be +2... because sum of all elements always gives 0!
Now we could count of oxidation number for nitrogen... we write HNO3 and start counting from right to left:
3*(-2) from oxygens + 1 from hydrogen = -5
so nitrogen must have +5 oxidation number... because sum all in formula must be 0.
Answer:
evaporation
Explanation:
The process of evaporation is as a result of water absorbing energy from the sun.
The process is a phase change in which liquid water changes into gaseous form.
- The water in gaseous form is called vapor
- This water cools and condenses in the atmosphere as it loses the energy it has gained.
- For evaporation to take place, water must absorb energy from the sun or other heating bodies.
- This will then cause vaporization of the liquid water into a gaseous form.
As density increases, the amount of salt or salinity increases. Salinity can decrease from the melting of ice or increase from the freezing of ice<span />
Answer:
Percentage yield is 96.15%
Explanation:
Theoretical yield = 13.0g
Actual yield = 12.5g
Percentage yield = ?
Equation of reaction
2Na + Cl₂ → 2NaCl
Percentage yield = (actual yield / theoretical yield) * 100
Percentage yield = (12.5 / 13.0) * 100
Percentage yield = 0.9615 * 100
Percentage yield = 96.15%
Percentage yield of NaCl is 96.15%
The oxidation number of chlorine can be determined by identifying first the oxidation numbers of oxygen and Na. Oxygen has a charge of -2 and has a total of -8. Na has +1. To make the total zero, Cl has to have a charge of +7.
