The behavior of PH_3 (g) is most likely to approach ideal behavior at 0.10 atm a

Question

The behavior of PH_3 (g) is most likely to approach ideal behavior at 0.10 atm and -100 degree C. 0.10 atm and 100 degree C. 1.0 atm and 0 degree C. 10 atm and 100 degree C. 1.0 atm and 100 degree C. The density of a gas is 1.25 g/L at STP. What is its molar mass? 17.9 g/mol 41.6 g/mol 37.6 g/mol 22.4 g/mol 28.0 g/mol The partial pressures of CH_4, N_2, and O_2 in a sample of gas were found to be 127 mmHg, 485 mmHg, and 653 mmHg, respectively. What is the mole fraction of nitrogen? 0.516 0.383 0.410 20.4 0.859 In the van der Waals equation, (P + an^2/V^2) (V - nb) = nRT the effect of intermolecular forces is accounted for by T. V. a. P. b. Which molecule or ion is not planar? F_2CCF_2 XeF_4 NO^-_3 BCl_3 CF_4 The molecular geometry of the nitrite ion, NO^-_2, is best described as trigonal planar. tetrahedral. pyramidal. trigonal pyramidal. bent.

Explanation / Answer

6. (B); at low pressure and high temperature the molecules are furthest apart and least likely to attract each other.

7. (E)

density of gas = 1.25 g/L at STP

1 mole gas at STP occupies 22.4 L

therefore 22.4 L gas (1 mole) weight is equal to its molecular weight = 28 g/mol.

8. (B)

mole fraction of N2 = N2 partial pre./total pre. = 485/1265 = 0.383

9. (C)

10. A, D are planer.

11. (E)

best wishes.

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