A 2.00 liter evacuated container has a mass of 1050.0 g. When the container is filled with an unknown gas at 800. mm Hg pressure and 25.0 °C the mass is 1052.4 g. What is the molar mass of the gas (in g-mol"')? (A) 28
(B) 31
(C) 54
(D) 56

(A) 28

Explanation:

To solve this problem we use the PV=nRT equation, where:

We input the data:

And solve for n:

Now we calculate the gas' mass:

Finally we calculate the unknown gas' molar mass, using its mass and its number of moles:

So the answer is option (A).

the correct answer would be d. hope this !

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