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Levart [38]
3 years ago
5

How much heat does it take to melt 5.0g solid copper?

Chemistry
1 answer:
Leya [2.2K]3 years ago
5 0

Answer:

Q=1.04kJ

Explanation:

Hello,

In this case, for latent heat (phase change) we need to consider the enthalpy associated with the involved process, here, melting or fusion; thus, the enthalpy of fusion of copper is 13.2 kJ/mol, therefore, the heat is computed as:

Q=m\Delta H_{fus}

Nevertheless, since the given enthalpy is per mole of copper, we need to use its atomic mass to perform the correct calculation as follows:

Q=5.0g*\frac{1mol}{63.54}* 13.2\frac{kJ}{mol}\\ \\Q=1.04kJ

Which is positive as it needs to be supplied to the system.

Best regards.

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The table compares some characteristics of two atoms.
olya-2409 [2.1K]

Answer:

               Atom X and Atom Y occupy the same position in the periodic table because they are isotopes

Explanation:

            The table is as follow;

Atom/Charged particle                  # of neutrons                Mass #

                X                                              6                                12

               Y                                             7                                13

As we know the Mass number is the total number of protons and neutrons in the nucleus of an atom so,

Mass #  =  # of Protons + # of Neutrons

Solving above equation for protons,

# of Protons  =  Mass # - No. of Neutrons

For Atom X:

# of Protons  =  12 - 6

# of Protons  =  6

For Atom Y:

# of Protons  =  13 - 7

# of Protons  =  6

Hence, it can be concluded that the number of protons for both atoms are the same. Also, we also know that atoms having same no. of protons (atomic number) are the same elements.

Conclusion:

                  Atom X and Atom Y are two isotopes of Carbon with atomic number 12. One isotope has a mass number of 13 and have a chemical symbol of ¹³₆C while the other has mass number of 12 and with chemical symbol of ¹²₆C.

   

7 0
3 years ago
Oxygen is a non-mental?<br><br>True<br><br>False
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Which of the following statements is not true for an exothermic reaction? Question options: The products have a higher heat cont
dsp73

Answer:

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Explanation:

The statement above is not true for an exothermic reaction because in an exothermic reaction heat is released to the surroundings. This simply means that the total energy of the products is less than that of the reactants.

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Answer:

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