Chemistry

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I have tied to solve this problem but am stuck. Hoping what I have done so far is accurate but need help in conversion.

What mass, in grams, of oxygen gas (O2) is contained in a 10.5 liter tank at 27.3 degrees Celsius and 1.83 atmospheres? Show all of the work used to solve this problem.

n = PV/RT

(1.83) (10.5)
(.0821) Latm (27.3 +273 = 300.3)
molK
.779 mol
NEED TO PUT INTO GRAMS

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