3 years ago

Which is the best example of the law of conservation of energy?

Chemistry

2 answers:

asambeis [7]3 years ago

7 0

Answer:

The answer is B. A rolling skateboard slows down because some of its kinetic energy changes to heat.

Explanation:

The law of conservation says energy cant be created or destroyed .Which basically eliminates all of them except b. It can only be transferred

Olin [163]3 years ago

5 0

Answer:

Explanation:

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Answer:

$P_A=4.20atm\\\\P_B=17.1atm$

Explanation:

Hello!

In this case, since the equation for the ideal gas is:

$PV=nRT$

For each gas, given the total volume, temperature (28.1+273.15=301.25K) and moles, we can easily compute the partial pressure as shown below:

$P_A=\frac{n_ART}{V} =\frac{1.21mol*0.082\frac{atm*L}{mol*K}*301.25K}{7.12L} \\\\P_A=4.20atm\\\\P_B=\frac{n_BRT}{V} =\frac{4.94mol*0.082\frac{atm*L}{mol*K}*301.25K}{7.12L} \\\\P_B=17.1atm$

Best regards!

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3 years ago