3 years ago

The electrons in an insulator are tightly bound to their atoms.

Chemistry

2 answers:

Murrr4er [49]3 years ago

4 0

If its a true or false statement . the answer is true

Ierofanga [76]3 years ago

4 0

What is it asking?Is it supposed to be true or false?

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Ethanol, CH.0, is common beverage alcohol. At its boiling point of 78.5 °C, the enthalpy of vaporization of ethanol is 38.6 kJ/m

garik1379 [7]

Answer:

209.8 kilo Joules heat is required to vaporize 250 g of ethanol at 78.5 °C.

Explanation:

Mass of an ethanol = 250 g

Molar mass of ethanol = 46 g/mol

Moles of an ethanol = $n=\frac{250 g}{46 g/mol}=5.435 mol$

Enthalpy of vaporization of ethanol = $\Delta H_{vap} =38.6 kJ/mol$

Heat required to vaporize 250 g of ethanol at 78.5 °C : Q

$Q=n\times \Delta H_{vap}$

$=5.435 mol\times 38.6 kJ/mol=209.7826 kJ\approx 209.8kJ$

Q = 209.8 kilo Joules

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