What is the pressure of a 17.3-L gas sample containing 7.02 mol of gas at 35.1 d

Question

What is the pressure of a 17.3-L gas sample containing 7.02 mol of gas at 35.1 degree C? (R = 0.0821 L atnv(K mol). 1 atm - 760 torr) 10.3 mmHg 8.89 times 10^2 mmHg 7.80 times 10^3 mmHg 1.35 times 10^-2 mmHg 7.40 times 10^1 mmHg How many moles of gas are in a gas sample occupying 0.812 L at 118 mmHg and 39 degree C? 0.00492 mol 29.9 mol 3.74 mol 0.000404 mol 203 mol The density of ethane. C_2H_6 (30.1 g/mol). at 28 degree C and 1.25 atm pressure is 1.34 g/L. 18.3 g/L. 0.657 g/L. 0.152 g/L. 1.52 g/L. Which of the following liquids would make a good solvent for iodine. I_2? HCI H_2O CH_3OH NH? CS_2 An endothermic solution process is described by which of the following? delta H > 0, delta H > 0, solution feels hot solution feels cold delta H

Explanation / Answer

76. Pressure (P) = nRT/V

with,

n = 7.02 mol

T = 273 + 35.1 = 308.1 K

V = 17.3 L

we get,

P = 7.02 x 0.0821 x 308.1/17.3 = 10.26 atm x 760 = 7.8 x 10^3 mmHg

Answer : C) 7.8 x 10^4 mmHg

77. moles of gas (n) = PV/RT

= (118/760)(0.812)/(0.0821)(273 + 39)

= 4.91 x 10^-3 mols

Answer : A) 0.00492

78. Density = P. molar mass/RT

= 1.25 x 30.1/0.0821 x (273 + 28)

= 1.52 g/L

Answer : E) 1.52 g/L

79. Best solvent for I2,

E) CS2

80. Endothermic reaction is,

C) dH < 0, solution feels cold

81. The solubility of gases in water usually increases with,

C) decreasing temperature and increasing pressure

82. The solution with highest osmotic pressure is,

A) 0.15 m K3PO4

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