10. A certain gas expands in volume from 1.0 L to 2.0 L at constant temperature. Calculate the work done by the gas if it expands against a vacuum. (1 Latm = 101.3 J). (A) +202.6 J (B) -101.3 J (C) +101.3 J (D) 0 J (E) none of these

7. Which of the following statements is incorrect? (A) NF3 is a polar molecule. (B) The hybridization of the central atom is sp3 in ? (C) According to the molecular orbital model, the bond order of P2 molecule is three. (D) A material is made from Al, Ga, and As. The mole fraction of each element is 0.25, 0.26, and 0.49, respectively. This material would be an p-type semiconductor. (E) none of these

10. A certain gas expands in volume from 1.0 L to 2.0 L at constant temperature. Calculate the work done by the gas if it expands against a vacuum. (1 Latm = 101.3 J).
(A) +202.6 J
(B) -101.3 J
(C) +101.3 J
(D) 0 J
(E) none of these

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