Stoichiometry Level 3: The complete conversion of 90.0 grams of hydrogen to ammonia would require how many moles of nitrogen gas?

Which of these best describes an ionic bond?

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.