Answer:
c. 0.750 atm
.
Explanation:
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In this case, since the two vessels have different volume, we can see that the gas is initially at 3.00 atm into the 1.00-L vessel, but next, it is allowed to move towards the 3.00-L vessel, meaning that the final volume wherein the gas is located, is 4.00 L; therefore, we use the Boyle's law to compute the final pressure:

Therefore the answer is c. 0.750 atm
.
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Sharing of electrons always means its a covalent bond, and unequal means it is polar, so it is a polar covalent bond