Answer:
nonpolar covalent bond: A covalent bond in which the bonding electrons are shared equally between the two atoms. polar covalent bond: A covalent bond in which the atoms have an unequal attraction for electrons and so the sharing is unequal.
Answer is: 22,65 gramsof methanol <span>must be burned.
</span>Chemical reaction: CH₃OH + 3/2O₂ → CO₂ + 2H₂O. ΔH = -764 kJ.
Make proportion, if one mole of ethanol release 764 kJ of heat, than:
1 mol : 764 kJ = n(CH₃OH) : 541 kJ.
n(CH₃OH) = 0,708 mol.
m(CH₃OH) = n(CH₃OH) · M(CH₃OH).
m(CH₃OH) = 0,708 mol · 32 g/mol.
m(CH₃OH) = 22,65 g.
Recall the ideal gas law,
<em>P V</em> = <em>n R T</em>
Find the amount of CO₂ in the sample, <em>n</em> :
<em>P</em> = 686 mm Hg ≈ 91,459 Pa
<em>V</em> = 6.34 L
<em>R</em> = 8.3145 J/(mol•°K)
<em>T</em> = 73 °C = 346.2 °K
→ <em>n</em> = <em>P V</em> / (<em>R</em> <em>T</em> ) ≈ 0.20147 mol
Now find the volume <em>V</em> of the sample when the temperature <em>T</em> is 35 °C = 308.2 °K :
<em>V</em> = <em>n R T</em> / <em>P</em> ≈ 5.6349 L ≈ 5.63 L