3 years ago

Which of the following is an example of an endothermic process?

1 answer:

7 0

Evaporation because water absorbs the heat so the particles have more energy and can break away from bonds holding them together (turn to gas)

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Firlakuza [10]

Answer: -134 kJ

Explanation:

The balanced chemical reaction is,

$3NO_2(g)+H_2O(l)\rightarrow 2HNO_3(aq)+NO(g)$

The expression for enthalpy change is,

$\Delta H=\sum [n\times \Delta H_f(product)]-\sum [n\times \Delta H_f(reactant)]$

$\Delta H=[(n_{HNO_3}\times \Delta H_{HNO_3})+(n_{NO}\times \Delta H_{NO})]-[(n_{H_2O}\times \Delta H_{H_2O})+(n_{NO_2}\times \Delta H_{NO_2})]$

where,

n = number of moles

Now put all the given values in this expression, we get

$\Delta H=[(2\times -207)+(1\times 90)]-[(1\times -286)+(3\times 32)]$

$\Delta H=-134kJ$

Therefore, the enthalpy change for this reaction is, -134 kJ

6 0

3 years ago

ankoles [38]

The answer would be D!

3 0

3 years ago

ladessa [460]

It is C bc I’m right anyits a free country

3 0

3 years ago

Monica [59]

Answer:

26.4 960 for the first one

8.9569 for the second one

7 0

3 years ago

son4ous [18]

Answer:

Ramsey and Marshall method.

Explanation:

The specific latent heat of vapourization of a liquid is measured by a modification of the method of Ramsey and Marshall in the year 1896.

8 0

3 years ago