Question

1) Sodium sulfate (142.04g/mol) decomposes upon heating to form sodium sulfide and oxygen gas. If 43.7 mL of oxygen was collected at 22.0°C and 727 mm Hg, what is the % of sodium sulfate in the sample?

2) Determine the specific heat capacity of an alloy that requires 59.3 kJ to raise the temperature of 150.0 g alloy from 298K to 398K. A) 4.184 J/g° C B) 1.87 J/g° C C) 2.29 J/g°C D) 3.95 J/g° C E) 2.53 J/ g° C

3) When methane, CH₄ undergoes combustion, how many liters of O₂ react with 5.0 liters of CH₄? All gas volumes are measured a the same temperature and pressure but not at STP. A) 20 L B) 2.5 L C) 10 L D) 5.0 L E) 0.22 L