From the combustion of octane, the formaldehyde will be formed as this equation:
C8H18 + O2 → CH2O + H2O this is the original equation but it is not a balanced equation, so let's start to balance it:
the equation to be balanced so the number of atoms on the right side of the equation sholud be equal with the number of atoms on the lef side.
-we have 8 C atoms on left side and 1 atom on the right side so we will try putting 8 CH2O on the right side instead of CH2O
C8H18 + O2 → 8 CH2O + H2O
we have 2 O atoms on the left side and 9 atoms on the right side so we will try first to put 9 O2 instead of O2 on the left side and put 2H2O on the right side and put 16 CH2O instead of 8 CH2O to make the atoms of O are equal on both sides = 18 atoms
C8H18 + 9 O2 → 16 CH2O + 2H2O
put now we have 8 atom C on the left side and 16 atom on the right side so, we will put 2 C8H18 instead of C8H18 now we get this equation:
2C8H18 + 9O2 →16 CH2O + 2H2O
-now we have 36 of H atoms on both sides.
- and 16 of C atoms on both sides.
- and 18 of O atoms on both sides.
now all the number of atoms of O & C & H are equal on both sides
∴ 2C8H18 + 9O2 → 16 CH2O + 2 H2O
is the final balanced equation for the formation of formaldehayde
Answer:
Q = 7898.38 J = 7.898 KJ
Explanation:
∴ ΔHv H2O = 47 KJ/mol = 47000 J/mol
∴ molar mass H2O = 18.015 g/mol
⇒ ΔHv H2O = (47000 J/mol)*(mol/18.015 g) = 2608.94 J/g
∴ m H2O = 2.73 g
⇒ ΔHv H2O = (2.73 g)(2608.94 J/g) = 7122.406 J
∴ C H2O = 4.18 J/g°C
∴ ΔT = 100 - 32 = 68°C
⇒ Q = (2.73 g)(4.18 J/g°C)(68°C) + 7122.406 J
⇒ Q = 775.975 J + 7122.406 J
⇒ Q = 7898.38 J
Hi there!
Rutherford's experiment showed that the atom's nucleus <em>did </em>have a positive charge. The α particles' trajectory was altered when it went through the gold foil, which, in turn resulted in the discovery of the atom's positive charge.
I hope this helps!
Brady
Answer: The following can indicate that a chemical change has taken place, although this evidence is not conclusive: Change of odor.
Explanation:
The answer is B. Filtration. it only lets the water through, while the sand will stay on top.