1) How many grams of argon gas are present in a 7.5 liter sample that mm Hg at 35°C? exerts a pressure of 575 2) A 1.58 gram sample of C,H,X the element X has a volume of 297 mL at 769 mm Hg and 35°C. Identify 3) What mass of NaCN is needed to form 8.5 L of HCN at 22°C, 750 mmHg: 4) A 355 mL sample of O, and water vapor is collected at 27°C. The mixture exerts a total pressure of 775 mm Hg, with water having a vapor pressure of 27 mm Hg. How many grams of O, are in the mixture? 5) An effusion experiment takes 32 seconds to complete using NHyg How long would it take to perform the experiment using HBrg? 6) A 45 gram sample of iron metal loses 3,412 Joules of heat when cooling from 350°C to 180C. What is the specific heat (c) of iron? 0 gram sample of CaCl, is dissolved in a calorimeter containing 100 grams of water (c 4.18 J/g°C). The temperature of the water rises from 20.5â to 25.4â what is the heat of the reaction: CaCl2-Can 2cr 8) How much heat is generated in the production od 31.6 grams of AL,O,? AH =-3351.4 kJ 4AI + 30,-2 AL03 C,H, given: Î1 1 =-2599 kJ Î11 =-393.5 kJ Î11ã¼-285.8 kJ 9) What is the enthalpy of the reaction 2C+ H 2C,H, +50, 4CO, +2H,0 C+ 0, CO NH,+30, 2N,+ 6H,O