A gas originally having a pressure of 1.00 atm, a volume of 2.50 L, and a temper

Question

A gas originally having a pressure of 1.00 atm, a volume of 2.50 L, and a temperature of 25.0 degree C undergoes an expansion until the pressure is 0.850 atm, and the temperature is 15.0 degree C. What is the new volume of the gas? (a) 3.00 L (b) 2.84 L (c) 2.05 L atm (d) 2.34 atm (e) none of the above. If an ideal gas has a density of 0.357 g/L gas at 32.5 degree C and a pressure of 425 mmHg, the molar mass of the gas is (a) 128 g/mole (b) 16.0 g/mole (c) 8.25 g/mole (d) 47.4 g/mole (e) none of the above. The mass % O in Na_2 CO_3 is (a) 45.29% (b) 21.69% (c) 15.10% (d) 52.86% (e) none of the above A compound of oxygen and sulfur contains 50.05% by mass sulfur. The empirical formula is (a) SO (b) S_2 O_2 (c) S_2 O (d) SO_2 (e) SO_3 Consider the following sets of (n, 1, m_1, m) hydrogen atom quantum numbers: (i) (2, 0, -1, -1/2) (ii) (5, 5, 1, -1/2) (iii) (3, 2, 2, -1/2) (iv) (3, -1, 0, -1/2) (v) (9, 1, -1, -1/2) Which of the above is (are) correct? (a) (iii) and (v) (b) (ii) and (iii) (c) (iv) (d) (i) and (v) (e) none of the above How many molecules are contained in 0.0381 g of CO_2? (a) 8.31 times 10^19 (b) 6.47 times 10^22 (c) 5.21 times 10^20 (d) 1.58 times 10^24 (e) none of the above. Which of the following is false: (a) Sr^2+ is larger then Br^- (b) S F are arranged in order of decreasing atomic radii

Explanation / Answer

15) P1V1 / T1 = P2V2 /T2

P1 = 1.0 atm , V1 = 2.50 L , T1 = 250C = 298 K

P2 = 0.85 atm , V2 = ? , T2 = 150C = 288 K

V2 = (P1V1T2 / T1P2)

V2 = (1.0 x 2.50 x 288 / 298 x 0.85)

V2 = 720 / 253.3

V2 = 2.84 L

answer = option b = 2.84 L

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