What I understood from my teacher when he was explaining is that when you round the given number from the measurements into scientific figures or scientific notations I think that's because they well help you do the math easy and help you in science basically
A. Channel precipitation runoff into bodies of water.
Answer:
Separating the nails is so easy because some are attracted to a magnet and some are not also you could pick them out by hand and separate them.
Explanation:
I hope this helps
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Answer:
The heat of combustion of liquid butane is: -2636 kJ/mol
Explanation:
This problem is solved by using Hess law of heats summation:
We have the heat of combustion for gaseous butane:
C₄H₁₀ (g) + 13/2 O₂ (g) ⇒ 4 CO₂ (g) + H₂O (l) ΔHºcomb = -2658 kJ/mol
and we want the heat of combustion for liquid butane.
What we need to do is add the heat of vaporization for liquid butane to this equation:
C₄H₁₀ (l) ⇒ C₄H₁₀ (g) ΔHºvap = 22.44 kJ/mol
C₄H₁₀ (g) + 13/2 O₂ (g) ⇒ 4 CO₂ (g) + H₂O (l) ΔHºcomb = -2658 kJ/mol
<u>______________________________________________</u>
C₄H₁₀ (l) + 13/2 O₂ (g) ⇒ 4 CO₂ (g) + H₂O (l)
So,
ΔH comb liq butane = -2658 kJ/mol + 22.44 kJ/mol = -2636 kJ/mol
