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Lelechka [254]
3 years ago
6

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

Chemistry
1 answer:
Shalnov [3]3 years ago
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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Using the standard enthalpies of formation for the chemicals involved, calculate the enthalpy change for the following reaction.
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
Need help with this.
ankoles [38]
The answer would be D!
3 0
3 years ago
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In a combustion reaction, pentane (molar mass (MM) = 72.17 g/mol) burns, in the presence of oxygen (MM = 32.00 g/mol), to produc
ladessa [460]
It is C bc I’m right anyits a free country
3 0
3 years ago
(34.969amu)(0.7577) =<br> (36.966amu)(0.2423) =<br> +
Monica [59]

Answer:

26.4 960 for the first one

8.9569 for the second one

7 0
3 years ago
How would you measure the specific latent heat of vaporisation of a liquid?
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.

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