Question

15. In a mixture of helium and chlorine, occupying a volume of 12.8 L at 605,6 mmHg and 21.6°C, it is found that the partial pressure of chlorine is 143 mmHg. What is the total mass of the sample? a. 31.6 g b. 0.4 g c. 8.37 g d. 1.28 g e. 7.09 g 16. How much heat is liberated at constant pressure when 97.7 g of calcium oxide reacts with 29.0 L of carbon dioxide gas, measured at 1.00 atm pressure and 25.0°C? (R=0.0821 L.atm/(K.mol)) CaO(s) + CO3(g) - CaCO3(s); AH = -178.3 kg a. -3.11 x 10ºkJ b. -1.74 x 104 kJ c. -5.22 x 10 kJ d. -2.11 x 10 kJ e. -5.17 ~ 10 kJ

Answer 1

Рие . 462.6 766 = 0.6086 atm 0.6086 0.7968 = 0.763 mal 143 winno 0.18 & atm Pa = 760 0.18% 0.7968 = 0.235 me no pa T = (0.796 (12.8) (0.08 21) ( 273 +216) = 0. Une mal molne = 0.421 X 0.763 = 0.321 mel mel el = 0.421 - 0.321 - 0.0997 my wne = 0.321x 4 = 1.284 9 m me= 0.0997X 35.45= 3.53 gmx2 Male = 7.000 - 7000 + 1.264 = 8.34 9m (ca