How many neutrons are found in a stable isotope of uranium-235?

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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3 years ago

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Rudiy27

The answer of this question is D

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3 years ago

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What is the net cell reaction for the cobalt-silver voltaic cell? express your answer as a chemical equation?

slava [35]

Answer: The net ionic equation for the cobalt-silver voltaic cell is $Co(s)+3Ag^+(aq.)\rightarrow Co^{3+}(aq.)+3Ag(s)$

Explanation: In cobalt-silver voltaic cell, one half of the cell consists of cobalt electrode immersed in $Co(NO_3)_3$ solution ( which means that $Co^{3+}$ are present in the solution) and other half of the cell consists of the Ag electrode immersed in $AgNO_3$ solution ( which means that $Ag^+$ is present in the solution)