Graph the circle which is centered at (4,4)(4,4)left parenthesis, 4, comma, 4, right parenthesis and has a radius of 3 units.
1 answer:
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Answer:
-206.9kJ
Explanation:
Heat of combustion = -890kJ/mol
Mass of methane burnt = 3.72g
Unknown:
Heat liberated = ?
Solution:
Heat of combustion is the heat liberated when one mole of an element or compound is burnt completely in excess oxygen gas.
To solve this problem;
Find the number of moles of methane;
Number of moles =
Molar mass of CH₄ = 12 + 4(1) = 16g/mol
Number of moles = = 0.23moles
Now, heat liberated by 0.23mol of methane = -890kJ/mol x 0.23mol
= -206.9kJ