Which of the following choices describes the difference between work and power?

A. Work done is the net force in every equal time interval. Power is the work done in every equal time interval.
B. Power is the product of net force and displacement. Work is the power in every equal time interval.
C. Work is the product of net force and time. Power is the work done in every equal time interval.
D. Work is the product of net force and displacement. Power is the work done in every equal time interval.

A substance is something to do with mass that takes up space. The mass of a compound is the total amount of atoms present in grams that make up a molecule. The grams is the unit of mass. Hydrogen is oxidized when it gains oxygen and creates water in this reaction. Copper oxide, on the other hand, loses oxygen and is thus decreased.

Volume to mole conversion,1 mole = 22.4 L

So,

[tex]\frac{250}{22.4} \;mol\;=\;250\;L11.16 mol[/tex] H2 = 250 L of H2

Initially, moles of copper can be determined from the calculated moles of hydrogen gas.

Moles of Cu :

[tex]=\;11.16\;mol\;H2.\;\frac{1\;mol\;Cu}{1\;mol\;H2} \\=\;11.16\;mol\;Cu[/tex]

Now, mass of Cu comes out to be by using mole gram conversion factor,

[tex]Mole\;.\;\frac{Gram}{1\;mol}\\Mass of Cu=\;11.16\;mol\;Cu.\;\frac{63.546\;g\;Cu}{1\;mol\;Cu} \\=\;709.17\;g\;Cu[/tex]

Hence, the correct answer is 709.17 g Cu.

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