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katen-ka-za [31]
2 years ago
13

Which substance contains positive ions immersed in a sea of mobile electrons?

Chemistry
1 answer:
adell [148]2 years ago
7 0

Answer:

it’s B.CuO(s)

Explanation:

your welcome:)

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Hydrofluoric acid is what type of acid?
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How much heat is released as the temperature of 25.2 grams of iron is decreased from 72.1°C to 9.8°C? The specific heat of iron
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Answer:

Q=-697.06\ J

Negative sign says that release of heat.

Explanation:

The expression for the calculation of the heat released or absorbed of a process is shown below as:-

Q=m\times C\times \Delta T

Where,  

\Delta H  is the heat released or absorbed

m is the mass

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\Delta T  is the temperature change

Thus, given that:-

Mass = 25.2 g

Specific heat = 0.444 J/g°C

\Delta T=9.8-72.1\ ^0C=-62.3\ ^0C

So,  

Q=25.2\times 0.444\times -62.3\ J=-697.06\ J

Negative sign says that release of heat.

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