What would happen to the world if group 3 elements disappeared?

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.

What is the most common form of matter in the universe