How much faster does Nitrogen gas effuse when compared to Xenon gas? ​

How many liters of oxygen gas, at standard temperature and pressure, will react with 35.8 grams of iron metal? 4 fe (s) + 3 o₂ (g) → 2 fe₂o₃ (s)

What is the volume in liters of 7500 g of helium atoms. assume stp conditions.

Write the molecular formula for a compound with the possible elements c, h, n and o that exhibits a molecular ion at m+ = 128.063.