1-When 0.694 L of Ar at 1.20 atm and 227°C is mixed with 0.262 L of O2 at 501 torr and 127°C in a 400. mL flask at 27°C, what is the pressure in the flask?
2-How many grams of phosphorus react with 35.8 L of O2 at STP to form tetraphosphorus decaoxide?
P4(s) + 5 O2(g) -------- P4O10(s)
3-When 35.7 L ammonia and 41.0 L oxygen gas at STP burn, nitrogen monoxide and water are produced. After the products return to STP, how many grams of nitrogen monoxide are present?
P4(s) + 5 O2(g)------------ P4O10(s)