Answer:
tan(9pi/12) = 0.041146549
Step-by-step explanation:
The amount of heat (in KJ) released when 3.5 moles of CH₄ react is 3115 KJ
<h3>Balanced equation</h3>
CH₄ + 2O₂ -> CO₂ + 2H₂O ΔH = 890 KJ
From the balanced equation above,
1 mole of CH₄ reacted to release 890 KJ of heat energy.
<h3>How to determine the heat energy released by 3.5 moles of CH₄</h3>
From the balanced equation above,
1 mole of CH₄ reacted to release 890 KJ of heat energy
Therefore,
3.5 moles of CH₄ will react ro release = 3.5 × 890 = 3115 KJ of heat energy
Thus, 3115 KJ of heat energy were released from the reaction
Learn more about enthalpy change:
brainly.com/question/11967318
#SPJ1
So, if the father is 60, his son is half his age, which would be 30.
So, to find out how old the boy was when his father was 4 times his age, you would do, 30 divided by 4 (I believe).
You then should get, 7 1/2 years old the boy is.
Hope this helps! Have a great rest of your day! c:
Never since they have the same slope so they are considered parallel lines
