14.5L H2(g) reacted with excess O2(g) at STP to yield 9.52g H2O. What is the percent yield of H2O?

Which fact represents evidence for the big bang theory?

Can someone me with 6 to 10 plz this is for masteries test.

Asample of freon gas has a volume of 2.23 liters, a pressure of 4.85 kpa, and a temperature of -1.36°c. calculate the volume at a pressure of 1.38 kpa and a temperature of 5.5°c. (show work)